While doing a girl from behind, right before blowing your load, pull out and finish in your hands. Then grab her stomach and smear it around her waist like a championship belt. Because, well, she earned it.
Austin: Did I just see that girl leave your room with a sticky stomach?
Ogewu: Yea, I gave her the discount double check.
Austin: Cool bro! *high five*
Ogewu: I haven't washed my hands yet.