Something that scares the living shit out of you that isn't going to kill/hurt/maim you. Just grow a pair, deal with it, and move on. You can thank me later.
Rational fears:
1. That BIG fucking dog that accidentally got out of the neighbor's yard...AGAIN!
2. Ramifications of telling your boss to go fuck himself (or herself.)

Irrational fears:
1. Asking a guy/girl on a date. (OK, she says no, maybe laughs a little...tells her friend, who post it on...OK, maybe this is a rational fear!)
2. Getting screwed by a leprechaun. (Leprechauns have such small dicks...so I've been told.)
by StevieTheOldFrigginFart July 26, 2014
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When parents support their children to spend an obscene number of hours memorizing the digits of irrational numbers like √2, π, and e, so that they can out-parrot others in a contest, and win some medals or prizes for their “irrational” feats of memory.
Based on recent newspaper reports, irrational parenting seems to be rising in Singapore, especially among immigrants from India and Burma—the perceived paranoia to make an entry into the Singapore Book of Records has never been so strong among the “human parrots.”
by Fasters November 22, 2022
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(from Investopedia.com:) An infamous phrase uttered by Alan Greenspan in 1996 to describe the overvalued market at the time.

Really, it means you're way too happy about something.
ME: Holy crap, did you see that?!
DUDE: Man, you got a problem with irrational exuberance. STFU.
ME: THAT KICKED ASS!
DUDE: Seriously, STFU!
by pinano July 14, 2004
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an immediate dislike for someone or something that can't be justified or has no reason behind it.
Guy1: I don't like ________.
Guy2: Why?
Guy1: I don't know. I just don't.
Guy2: That, my confused little idiot, is irrational dislike.
by I like bagels August 4, 2011
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an intense feeling of opposition against an object for which there is no rational explanation
Justin has an irrational hatred against Quizno's; John has an irrational hatred against chain restaurants.
by anonymous February 24, 2005
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a person that doesn't belong in your friendship circle. this person can not be made in to a fraction of friendship pie.

an awesome phrase made by brooke
Golly, your suck an irrational number.
by Brooke with an "e" November 20, 2006
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"Irrational Rationalization", or "IR", is a commonplace, non-communicable infection of cranial cognition. People whom are exposed to this infection display a number of degraded brain cells, deprivation of motor skills, and failure to comprehend logic. "IR" is displayed when one, online, debates a fairly irrelevant point to an other. Hence the name, rationalization shown by the person infected is at a very low layer of mentality. For example, when the person debates about a sort of social media plot, the host will use derogatory language, such as, "faggot", a slang term created by humans because why not. Hosts also show many usages of deus ex machina, cutting into the other conflicts of people. One more way people exhibit "IR" is by collapsing on their own statements. This is a more widespread way of IR, utilized mostly on social media sites.
"IR" has no specific cure. However, "IR" is usually prevented by:
- Thinking more frequently
- Reading a book instead of performing inane stunts for publicity
- Avoiding putting gelid objects on your head
Psychotherapy sessions may be available for diagnosing "IR", although that is very unlikely.
Person A.: "lel your just jelous because your not smart #hashtagsaresoimportant"
Person B.: "According to this, you're jealous of me for having an advanced education in English. Irrational rationalization's bad."
Person C.: "I agree, Person A should take a diagnosis for the IR infection."
by Ninja of Logic August 22, 2014
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