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The placing of one's fist into one's grundle and letting it bake there for a minute, then removing it and punching another person across the face with it.
Bitch, if you don't shut your mouth, you're gonna get a big ol' grundlemuffin!
by Head Chef McC December 20, 2006
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A delicious mix of excavated nuts, mixed with grundle juice (see prior reference)and nether-yeast, baked overnight after a 5 hour tequila fu*k. Serve warm with coffee.
Honey, bring me some grundle muffin and some aspirin.
by Viva La Grundle January 24, 2006
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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