Urban Dictionary: Zipper Bumping

male becomes erect enough that his penis is pressed against the zipper of his pants.

Yo Ming! you see those two asian school girls making out on the bus, got me straight up zipper bumping....ya digggggg?

by RidiculousIsHe February 27, 2015

1. Lovers knocking into each other when in a rush to get both of their pants off to proceed with a hot make-out session.

Attempting to get their pants off quickly during the passionate heat of kissing on the boat, Sebastian and Nicollete were eagerly bumping zippers.

by ThegirlDJ October 03, 2007