When a mans semen is applied by whatever method to his stomach so that his stomach hair becomes pasted to his skin.
My boyfriend Karl didn't warn me he was going to cum and blew a giant load on my hands, so I wiped it all over him and laughed because he had cum stomach... He tried to hug me, but I got away, cum stomach is for boys!
by bowflecks June 25, 2009
The act known in many different and diverse cultures. Consisting of ejaculating onto one’s own stomach and rubing it in as if it were a moisturizer instead of cleaning it off.
Tyler: pass the Kleenex, I busted a fat nut.
Mitchell: Ew who uses Kleenex, try the Rub Cum Stomach.
Tyler: Ok, *rubs in cum*
Mitchell: Ew who uses Kleenex, try the Rub Cum Stomach.
Tyler: Ok, *rubs in cum*
by Mitchells Gay March 6, 2018