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Another name man's penis, using a musical metaphor.
Referring to a sexy woman, "I'd let her play a tune of my reproductive organ any day."
by maninboulder October 04, 2005
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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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