Top Definition
doing something crazy, joining whatever fun activity/event is being offered, short for "count me in", just saying YES,
friend #1: who's going skinny dipping with us tomorrow at Lulu's pool??
friend #2: Iiiiyynn, byob?
friend #3: Iiiiyynn, can I bring a friend?
friend #4: Only a female and if she's hot, lol. Iiiiyynn!!!

friend #1: we about to go Iiiiyynn!!! I'll bring the liquor! Hot females are welcome!
by CynCity February 11, 2010

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