When two cars are parked close enough together that you can rest each a butt cheek on each bumper to take a shit.
by Munchus Maximus December 4, 2013
Get the bumper dumpermug. by the dumper-bumper bandit February 25, 2009
Get the Dumper-Bumpermug. Someone who enjoys giving anal sex. Can be a straight male, who likes pounding a hot chic's ass, or a gay male.
by Dumper Bumper March 6, 2011
Get the Dumper Bumpermug. by Michael Boner November 14, 2010
Get the Dumper bumpermug.