When you're having sex, you shit in your hand and smear it across the buttocks of your partner, and proceed to hump aggressively.
David pulled a fucking rusty bumper on Max, and he didn't even see it coming!
a woman that eats crap loads of mexican food, including tacos
man look at that daaaaaaaamn bumper snootch
someone you'd only get with once
that chick was hot but just a fizzy bumper
Canadian sexual position where the man takes the woman from behind in a fashion similar to doggy style excepting that the female is gripping the horns of a stuffed and mounted moose head.
She likes to hunt so last night I gave her a moose bumper eh...
Another way to say "bountiful harvest"
"this years harvest is double of the years before!"
"What a Bumper harvest we got here!"
The homosexual sex act of bumping penises together
Just found out. My friend Bryan is a peter bumper. Oh Shit
To have sex in a doggy style position or to have sex in general
My wife was so horny last night she kept pestering me to "wreck the bumper"