The act of lifting up a collar on a collared shirt in order to show off the fact that your either a douchebag or that you have an oversized mole the size of Nigeria on ur neck.
Fag: Look at my popped collar.
Random Person: Why do you want to hide your neck so bad? Don't want to show off that hickie you got last night from that dumb slut you slipped some rufies?
Fag: The fact that I have a popped collar doesn't necessarily mean I love to take it from behind.
Random Person: Faggot.