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A generally used and abused penis.

A penis used so much it may resemble the appendage of a hundred year old hobbit..
That dude has fucked way too many people. He must be sporting some serious gollum dick.
by trbrown May 05, 2010
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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