When one has intense, vigorous sexual intercourse with themselves or their partner to the point where they lose all cognitive recognition.
"I remember the time Johnny gave himself The Gumper down behind my dad's camper with the life-sized blow up doll of Nicolas cage."

Honey, if you give me another Gumper I may never snap out of it.

Thanks babe, can I have another Gumper?
by Pseudosaur April 25, 2018
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By day, a bibby doof gumper is an ordinary, everyday Navy officer. By night, however, he is a hella evil terrorist who will stop at nothing to destroy America
Me: Hey dude, you seem to be a normal individual who is definitely not a terrorist at all
You: O, that's cool. By the way, America totally sucks.
Me: Dude, you're a "bibby doof gumper"
by hellacoolbrah June 26, 2010
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Boy that beny myers sure is spoiled and misbehaved.
Yes he does enjoy acting like a shumper gumper.
by kbens February 3, 2012
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dumper nociggies rolladumper raidtheashtray poor
‘Hey dude we are out of ciggies so hit the ashtray, dunno what’s in there but just roll up a Forest Gumper n roll with it
‘I’m so high. No smokes. Roll a Forest Gumper!’
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