After receiving hand job and cumming on your own tummy parter rubs the cum into the tummy.
Bro this girl just gave me the gnarliest crabs Cum Tum.
When the cum recipient gets your man-goo on their hands, then proceeds to pinch their fingers and thumb together, imitating a crab claw, and walks sideways out of the room.
Jenna is so crazy she did the cum crab after sex while my parents were staying over.