Someone who is doing/saying something idiotic or foolish

see Dubya

Somebody who's freakin' out and needs to chill. Can be used as a verb, noun or adjective.

Can be used as either a noun or a verb. As a noun, chimp describes someone who departs from a public house or club early to return to one's domicile. This could be for a variety of reasons: too ripped up to continue drinking, being ejected by bouncers (a corollary of being ripped) or being under the thumb. The verbal form is used to describe this act of baling out early: thus 'to chimp out'.

Infantile or mischeivous individual. A person with a childlike sense of humour.

(Verb)

To lose all human control and revert back to one's simian roots. Usually resulting from seeing an attractive woman or, if you are a comic book fan, a mint copy of The Avengers #1.

Describing a repulsive smelly creature, born of the human species, but acting as though he were a primate. Nappy dark hair, gross teeth, small red haired mating parter. Often attempts to read books, posters, and magazines, always failing. Communicates by making a series of noises like, "ooo ahhh ehhh ahhh ooo". Smells like an asshole.