Someone that either;

Doesn't understand an obvious(easy to get) joke.
Can't form a coherent sentence.
Doesn't know basic math to save their life.
Tumblr addict.
Chelsea Aitkens only sits on Tumblr all day going " I CAN'T EVEN ". What a retard.
by Muddy Waters Panda August 22, 2014
re·tard ri-tahrd, for 1–3, 5; ree-tahrd for 4 Show IPA

verb (used with object)
1. To make slow; delay the development or progress of (an action, process, etc.); hinder or impede.

verb (used without object)
2. To be delayed.

3. a slowing down, diminution, or hindrance, as in a machine.

4. Slang: Disparaging .

a. a mentally retarded person.

b. a person who is stupid, obtuse, or ineffective in some way: a hopeless social retard.

5. Automotive, Machinery . an adjustment made in the setting of the distributor of an internal-combustion engine so that the spark for ignition in each cylinder is generated later in the cycle.
EVE Online Example

A great example of "retard" in the EVE online community would be someone named Ocean Water. Also known for looking to share time with men as quoted below.

19:51:02 Ocean Water > Ocean Water I suggest you go out side look around find a man to share time with

20:55:39 Ocean Water > Ocean Water LLLOK uP LRRP READ before showing how much of an idiot you really are
by Dragnarok September 27, 2012
Any person who's mental deficiency has lowered his IQ to 70 or less. Retarded people usually have a very limited vocabulary and often times have trouble understanding reason or logic especially if the person speaking to the retard has an above average intelligence. Retards who's intellect has been severely impared sometimes make unnatural or spontaneous motions with their limbs which make other people uncomfortable. Speech may also be affected by mental retardation causing constant stuttering and mispronunciation of easy words. Retards can be considered by some as almost "inhuman." This is due to the fact that retards can not understand basic philosophy and have no perception of things they haven't physically experienced themselves such as the atom or the concept of infinity. Mentally retarded people should not be brought to public places like churches or public performances where much like babies, they can cause a disturbance due to noise.
Child: "Mommy why is that kid in the middle row making all those weird noises?"
Mother: "Don't worry Jimmy, he's just a retard."
by 010000110110111101100100011001 August 02, 2012
(R)eply (E)veryone (tard)

Someone who has not mastered the very simple difference between email's "reply" and "reply all" actions. The RE-tard is consistently spamming a distribution list's mailbox with their comment, which is relevant only to them and the sender. A true RE-tard will do this even when the original sender of an email to many people list explicitly requests recipients do not "reply all."
I can't stand it when a new system rolls out at my job. My AVP boss always spams her stupid questions to the whole company like the RE-tard she is.
by Longshot Lar March 06, 2012
The modern equivalent of attention-whoring, infiltrating reactionary College Republicans: In the 1980's people like Grover Norquist, Jack Abramoff and Ralph Reed infiltrated college campuses passing out phony-populist, pro-corporatist and anti-leftist pamphlets and material. This was counter and reactionary to the counterculture or hippie movement a decade earlier. Today they do this kind of thing on the internet, infiltrating forums and other websites, proselytizing their backward messages. We already know what the R stands for, the etard is the web equivalent of these types.
FreedomWorks maintains an army of R-etards to constantly whine and bitch about the federal government in their relentless proection of the profits of companies who outsource jobs.
by DEDC August 09, 2011
ReTard n. Portmanteu of "Republican" and "retard". Someone who, intoxicated by an assumption about being knowlegable and right about politics and economics, forgets that they need to get actual real ordinary people to support them if their agenda is to be advanced. Often but not always middle class, easily led and with poor insight to society's problems, and naive about the mechanics of politics and utterly ignorant about how power actually works.
The Tea Party is utterly ReTarded
by ConBasher July 19, 2014
The growing of a fungus
Stop that fungus from retarding.
by chriztopher December 28, 2012

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