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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 May 30, 2018
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