Top Definition
1. fucking the shit out of an old dude until he has a heart attack

2. tryin to insert your dick into a frisky squirrel.
"I caught that whore fucking my grandpa!"
"Yeah man, she was pumping a grumpy"

"Last night i was pumping a grumpy, and the mother fucker bit me"
by Big Jerms July 27, 2005
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