Top Definition
A guy who likes to grind his penis into a woman's ass while she is still wearing her panties.
Most panty pumpers love to have sex with girls who wear skin tight panties.

Panty Pumper: Boy, I'd like to pump her panties !
#skin tight panties #ass #panty #panty rider #rear entry
by Duckman16 October 13, 2014
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