Roommate 2: No, Roommate 3 is being a prune and is spending all day in the dorm, and he'll totally rat on us if we smoked while he was in the room.
Roommate 1: Fuck man, prunes ruin everything.
-You mean the sleazy one hitting on all the girls?
-Yeah, what a prune.
To erase information, usually personal information, that was posted on the Internet in an attempt to reclaim anonymity.