As an adjective, any sort of typically degenerate behavior. Usually said in the context of sexual promiscuity or alcohol related misconduct.
Celeste: I woke up naked and didn't even know which dorm I was in.
Haley: Omg Celeste stop being so college!
George: It's Wednesday night, so obviously we're hitting the bars and getting blackout.
Adam: How college of you!
Hannah: IM SO DRUNK
Celeste: COLLEGE!
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