It's a butt that is is very big and attractive were you wanna hit it. Like in bumper cars you wanna hit the other people.
My boyfriend has a bumper butt
di Gpnfa 10 luglio 2014
A game played while on the bus whereby two (or more) people repeatedly touch butts (tap ass, moon landing, etc).
"Wow that was an exhilterating game of bumper butts! I feel like I owe you a drink!"
di gjcourt 09 novembre 2012

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