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."
#smash #fat #sex #drunk #girls
by Kenny Todd December 05, 2007
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