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Someone who hasn't had anyone "knock on the backdoor" - Kane Show War of the Roses
"Megan is still a virgin but not a buttgin."
by Kane Show February 20, 2014
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Someone who hasn't had anyone "knock on the back door."
Guy: Do you know if that girl at the end of the bar is into anal?

Bartender: I'm not sure, I think she's a buttgin.
by TheSnowMan52896 February 20, 2014
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A person who has yet to have anal sex.
"Dude, has Jim stuck it in Nancy's cornhole yet?"
"Nah, they're both total buttgins"
by xoxobitty February 20, 2014
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