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The type of ass that when you slap it, the jiggles make it feel like the ass slaps your hand back
Yo, Sydney got an ass though.
Yeah, I heard she got that Slap-back Booty.
Hell yeah, my hands still stingin from it bro.
by Trojanman Murphy October 02, 2013
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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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