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
When two lesbians have sex. Nothing goes in or out, just a lot of bumping of things.
Paula and this slut went to play bumper cars...and I watched them play all night...
by Remy November 08, 2004
(verb) bump•er car When an enormously fat person tries to get around you in a crowded place, usually resulting in you being knocked back a few feet away by their huge love handles.
Karen: Joanie, did you see what just happened?
Joanie: Did some cuntbandit steal your drink again?
Karen: No! Some stupid fatass just bumpercarred me right into the garbage can.
Joanie: Did you spill your drink?
Karen: No.
Joanie: Oh, thank god.
by reg&rob June 14, 2011
knobjockey
steven you bumpercar
by mike hunt August 19, 2003

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