1 definition by blahblahblah04

Top Definition
reverse motorboating; When a woman comes up behind someone and shakes her breasts against the back of that person's head... unexpected and possibly unwelcomed.
S: "I just saw something an now it's burned into my retina's"
E: "What is it?"
S: "That girl in the green shirt just went up to that girl who's sitting down and greeted her using the bumpercar technique."
by blahblahblah04 March 16, 2012
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