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A girl (or guy) who gives a guy an erection.
Guy 1: Dude, that chick's a penis sweller!

Guy 2: Who? RuPaul?

Guy 1: Yeah, why?

Guy 2: ...That's a tranny.

Guy 1: ...*retches 5 times, than pukes for 30 seconds* AHHHHHHHHH!!!!

Guy 2: ROTFLOL!
by SSBSfanboy December 23, 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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