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11.
To "bumper" refers to the act of collecting food left over by others after a meal in a restaurant (total strangers) and eating it yourself, without concern for potential infection. You do it after they've left but before the bus boy has cleaned up the table.
People have various "bumper lines," i.e., limits to which types of food or drink they're willing to bumper.
True "bumpering" is done regardless of whether the bumperer has money or is hungry. It's a principle-based practice to avoid wasting food. But hunger or poverty can also be major motivators.
"Dude, that couple's leaving behind a whole plate of fries!"
"Go bumper it bro!"

"Hey man, check out this sandwich I got."
"Is that a double burger with only one bite taken out?"
"Yea!"
"Oh man, what an excellent bumper."

"You want some of this soda I bumpered?"
"No man, drinks are past my bumper lines."
by brotherofthechamp September 03, 2009
 
1.
a booty, typically female
pull up to my bumper
by fizzle March 24, 2004
 
2.
A small device for dispensing doses of cocaine or crank.
Yo man, lemme see that bumper, I need to get my ass lifted.
by jimmy April 30, 2003
 
3.
A kiss ass party classified by a small group of awesomely intoxicated college or high school students. Normally employing loud music, innumerable amounts of alcohol, and the possible, yet probable use of marijuana. ( A small rager).
Hey, we're having a bumper at my house tonight, bring your shit.
by bumpasumpa January 17, 2011
 
4.
A 40 oz. bottle of malt liquor.
Pick me up a bumper of Micky's from the store.
by Nick Sangia March 26, 2003
 
5.
(London UK black Slang) A woman with realy petruding curves, ie: Enormouse tits and/or giant round arse. My type of woman.
I would love to bone Sherell! She's BUMPER man!
by Kilo Lobo June 14, 2003
 
6.
The indigenous Australian (Aboriginal) word for a discarded cigarette end that contains enough tobacco to be lit and enhaled.
"Ehhhh Cuz, gudda bumper, bruz?"

"Carn Cuz, gis ya bumper--- Darnt put it out in the bin, bruss, garn hafta gettim out cuz. Carn gissa bumper bruz?"
by Rock The Boat August 29, 2009
 
7.
A stupid, incompetent person. Somebody who is totally uncomprehending and unaware of basic requirements in a range of social contexts. Also, somebody who is incapable of performing routine tasks.

Used in parts of Australia as a noun ("You're a bumper, mate!") and occasionally as an adjective, e.g "He supports a bumper football team."
"That bloke is useless, He's a total bumper!"

"He's too much of a bumper to ever work that out!"

"Only a bumper wouldn't be able to do that."

"That's a bumper thing to do!"
by Jay De July 19, 2009