Top Definition
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
2 more definitions
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
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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