Top definition
Having sex with a female that is particularly promiscuous or vaginally loose.

(Main Street being a very wide street in Palmerston North, NZ
"Yeah man I boned that chick too... was like Throwing a sausage down Main Street"
by Max Guy September 09, 2007
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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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