Top Definition
Homosexual intercourse; referring to lesbian vaginal sex.
Jackie and Stacy were going bumper to bumper last night...and by that, I don't mean their cars.
by randomlysmart April 13, 2014

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When There is a traffic jam and the cars almost touch each another.
Traffic Jam
Oh man, look over there: there is a terrible bumper to bumper on that road.
by Marcelo Rodrigues August 02, 2007

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