Cum on a girls face and when she asks for a towel to wipe off with, get dressed and leave.
If roommate or friend is present, tell them that their friends needs their help, and send them up to the bedroom.
Doug: I towel bounced the shit out of some bitch the other night.
Chris: What is towel bouncing?
Doug: I busted on her face and on the way to "get a towel", I bounced.