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