An extremely well-endowed man can "tummy fuck" a girl by penetrating her vagina so deeply he pushes into her cervix. The penis must be abnormally long, and women say that the deep thrust feels like it's in their stomach--thus "tummy fuck."
n., a side effect of being hungry or craving food, similar to growlies or the munchies. derived from winnie the pooh's phrase, 'there's a rumbly in my tumbly.'
I've got mad tummy rumblies; can you pass me the chips?
Two guys lie down on the floor facing each other and both grind their erect penises against the belly of the other person. The first person to come loses.