Top Definition
The act of making love to someone in an unsatisfactory way.
She complains I was just another underfuck.
by Frank1957 October 17, 2007

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A complete letdown. Something you don't want.
Yeah man, my summer is a total underfuck.

Our fuck was a total underfuck.
by Ownthink June 29, 2005

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Lotsa space for your liquids.

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