A word used to describe someone who is profoundly stupid. A type of stupidity that is an insult to intelligence itself. Politically correct people would like you to be rude to someone in a less offensive way, perhaps by calling them dumb instead. This ignores the fact that dumb, idiot, and many other similar insults used today were all old-timey technical terms for retards. It also ignores the fact that any word used to describe someone of below average ability in any area is an insult to someone with average ability or higher in that area.
<<This party is retarded.

>>Dude! You can't say that anymore. You have to say the party is lame, or it's dumb, or something else!

>> Get the fuck out of here with that bullshit. You just insulted people who cannot walk and people who cannot talk.
by Solve'et Coagula September 27, 2015
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It means "very stupid" but in a more hilarious, weird, and/or spontaneous way. From the Latin word for "slow".

If you want to tick off a politically correct person, just say it. They think it's mean because people with mental problems are not always stupid, except you can't call those people "retarded" in the first place, and nobody cares anyway. Plus, once again, it's from the Latin word for "slow".
*Guy 1 is dancing very strangely.*
Guy 2 to Guy 3: Look at Guy 1 dancing like he's retarded.
by Morshu34576345624555555 October 20, 2013
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An "unofficial" (not recognized by dictionaries) slang descriptor for a person/thing/action/object, etc., or a combination of, which is one or more of the following:

a waste of time, abandoned, abject, abominable, abortive, absurd, afraid, aimless, anxious, apprehenaive, arid, arrested, assailable, atomic, awful, baby, babyish, backward, bad, banal, barmy, barren, base, baseless, bastard, beastly, beggarly, behind, beside the question, blah, bland, bogus, bomb, bootless, boyish, brainless, bromidic, bummer, caitiffcapricious, careless, catchpenny, characterless, cheap, checked, cheesy, childish, childlike, clichéd, cloying, coarse, colorless, common, commonplace, confusing, contemptible, cotemptible, controvertible, conventional, cool, corn, cornball, corny, corrupt, counterproductive, cowering, cracked, crap, crappy, craven, crazy, crud, cruddy, daffy, daft, dastardly, dazed, dead, deadpan, deficient, degraded, degrading, dejected, delayed, delusive, dense, dense, deplorable, depraved, despicable, destitute, detestable, devoid, diffident, dim, diminutive, dippy, directionless, dirty, disgraceful, dishonest, dishonorable, dismayed, disposable, disreputable, dizzy, dodo, doltish, dopy, dotterel, down, downtrodden, drab, drifting, drudging, dull, dumb, empty, empty-headed, erratic, evanescent, everyday, evildoer, excessive, exhausted, expendable, expressionless, facetious, failed, failing, faint-hearted, fallacious, false, fanciful, fatuous, fawning, featherbrained, feeble, feebleminded, fickle, flaky, flashy, flat, flighty, flimsy, flip, flippant, fool, fool around, foolish, for grins, forlorn, fortuitous, foul, freaked out, freaky, frightened, frivolous, frothy, fruitless, futile, gagged up, garbage, garish, gay, giddy, girlish, glitzy, goalless, good-for-nothing, goofy, green, gross, groundless, groveling, grungy, gullible, gutless, hackneyed, half-baked, half-witted, hang dog, harebrained, heedless, ho hum, hokey, hokum, hollow, hopeless, humble, humbling, humdrum, humiliating, idiotic, idle, ignoble, ignominious, ignorant, ill-advised, ill-considered, illogical, imbecile, immaterial, immature, immobile, immoral, impassive, implausible, impracticable, impractical, improbable, inadequate, inane, inapplicable, inappreciable, incidental, inconceivable, incongruous, inconsequential, inconsiderable, incredible, indelicate, indiscreet, indiscriminate, ineffective, ineffectual, inept, inessential, inexpressive, infamous, infantile, inferior, inglorious, inscrutable, insensate, insignificant, insincere, insipid, insufficient, interminable, inutile, irksome, irrational nonsensical, irrelevant, irresolute, irresponsible, jejune, jittery, joking, joshing, junky, juvenile, kid stuff, kooky, lacking courage, lame, late, laughable, lemon, lifeless, light, light-minded, lily-livered, little, loathsome, loony, loser, lousy, low, low-born, lowly, lowly, low-ranking, ludicrous, mangy, meager, mean, meaningless, measly, mediocre, menial, mentally incompetent, meretricious, microscopic, mindless, minor, minute, indecisive, miscarried, miscreant, miserable, modest, momentary, monkey, monotonous, moronic, moth-eaten, naive, needless, negligible, nervous, niggling, nihil ad rem, no bargain, no dice, no good, no guts, no place, no-account, nonessential, nonsensical, not at issue, not serious, not to the purpose, nothing, nowhere, nugatory, hopeless, nuts, nutty, objectless, obscure, obtuse, odd, off offensive, old hat, old-fashioned, ordinary, otiose, outcast, paltry, panicky, pathetic, pedestrian, peripheral, petty, piddling, pitiable, pitiful, platitudinous, playful, plebeian, pointless, poker-faced, poor, potty, pre-kindergarten, preposterous, primitive, profitless, proletarian, prosaic, puerile, puny, purposeless, pusillanimous, random, rash, ratty, raunchy, recreant, removable, repetitious, result less, retiring, rinky-dink, rotten, rough, routine, rubbishy, run scared, sappy, scandalous, scanty, scared, scatterbrained, screwy, scrubby, scurvy, second-rate, seemly, senseless, sentimental, servile, severe, shabby, shallow, shameful, shiftless, shoddy, shopworn, shrinking, shtick, shy, silly, simple, simple-minded, skin-deep, sleazy, slight, slimy, slow, sluggish, small, small time, soft, sordid, sorry, sorry lot, spineless, sportive, squalid, square, stale, stale, stark, stereotyped, sterile, stiff, stock, stodgy, stolid, stray, stuffy, stupefied, stupid, submissive, subnormal, superficial, superfluous, tame, tatty, tawdry, tedious, terrible, the subject, the willies, thick, thickheaded, thin, thoughtless, threadbare, timid, timorous, tired, tiresome, tiring, tomfool, tongue-in-cheek, transparent, trashy, trifling, tripe, trite, trivial, trumpery, ugly, unassuming, unavailing, unbelievable, uncommunicative, unconvincing, uncouth, underdeveloped, underfoot, underprivileged, undevelopedundirected, undistinguished, unessential, unexciting, unexpressive, unfit, ungrounded, unguided, unimaginative, unimportant, unintelligent, unmanly, unnecessary, unneeded, unoriginal, unpersuasive, unplanned, unpredictable, unpretentious, unproductive, unprofitable, unreal, unreasonable, unrefined, unrelated, unsatisfactory, unsophisticated, noncommital, unsubstantial, unsuccessful, unthinking, unusable, unvaried, unworthy, uselessvacant, vacuous, vagrant, vaguevain, valueless, vanishing, vapid, vile, plebeian, volatile, vulgar, wackywandering, wanton, waste, watery, wayward, weak, wearisome, well-worn, whimsical, white elephant, wide of the mark, wide of the point, wishful, wishy-washy, witless, worthless, wretched, or yucky.
There are literally a thousand different uses for the slang version of "retarded" - (Quick note:) Usage-wise, it came before and set the precedence of the way we use "gay" in slang today - used correctly, they're practically interchangable.

"That test was really gay!"
"Oh yeah, our chemistry teacher is being retarded."

"Mary, stop being retarded! You're so gay, grow up!"

"I thought it was a simple babysitting job, but I was wrong. Besides all the other stuff, I had to clean up after the retard, which was pretty retarded. To top it off, he set the carpet on fire, which I had to put out with the flame-retardent extinguisher. And after all of that, the parents only paid me $15. Babysitting is gay."
by TBB August 05, 2005
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(a.k.a. R-word)
Adjective:
1. Used to describe someone less mentally and/or physically developed than others of their age. This term is now considered derogatory. (Also can be used as a noun.)
2. A generic insult or emphasis to describe how stupid/appalling/etc. something or someone is.

Verb:
3. To have been slowed down/delayed.
1. This student is mentally retarded, so he is in a different class.
2. This movie was so retarded! The acting, story, and special effects sucked!
3. The famine retarded the growth of population.
by AFN7 December 24, 2015
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