a.) The act of fucking a female vagina in a rapid, steady manner. Derived from drawing water from the ground by using of a hand pump. Pussy pumping, in comparison, is "pumping" the pussy with a cock to extract an orgasm.
b.) The rapid movement of any object, hand, or penis in a vagina to extract an orgasm.
When a girl's vagina is so plump that it makes her panties, (and in some cases, her pants) bulge out at her crotch.
"Hey Mike, what are you staring at?"
"She's so hot, but when she steps out of the pool my eyes are immediately drawn to the sight of her enormous Pumpkin Puss."
The round pertrusion at the front of a fat or obese individual located between the genitals and the gut.thus resembling a pumpkin also known as front butt!!