Chimp
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'.
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