Cooper

Cooper is a verb that refers to discarding a beer that is not completely finished.

Dude, you coopered the shit out of that beer. It's still half-full.
Don't cooper your beers, boys. We're almost out.
Who keeps leaving these coopered beers on the kitchen counter?
If I catch you coopering your beer again, I'm going to go Slimnasty on your sorry ass.

by Kitsch Dixen December 03, 2010