Top definition
A particularly fat girl who for some reason is hot enough to have sober, consensual sex with.
"Dude, the girl your workin' on is hot, but her chunky friend isn't that bad."

"Yeah, she's a Smashtadon, fosho."

"Should I smash?"

"Yeah, Smashtadons are like unicorns, often talked about but seldom seen."
by Kenny Todd December 05, 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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