Top Definition
the bit of skin between a woman's beaver and butthole; also known as the "'taint" ('cause it 'taint her pussy and it 'taint her asshole).
"i was screwing her for so long, my balls got sore from bouncing against her dirty inch.
by jimmyweeds May 14, 2004

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The truly un-named distance between the asshole & corresponding genitalia, for men the nuts & women the pussy. Always the victim of shrapnel from sex, exercise & any other body fluid exuding activity, hence the name.
After going at it for a while her dirty inch was gettin' a little gummy.
by redsuperdog January 28, 2009

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The anus and surrounding flesh, as it is about 1" diameter. Not necessarily clean nor dirty, it is called the 'dirty inch' because it is the excretory region on the human body.
I was doing her from behind and without warning I slipped it into her dirty inch.
by eerie February 19, 2005

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