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Someone with a realy round ass.
"Man does that cheerleader have a realy plump ass!"
by Sum1Anonymous May 21, 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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