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The smell that rises from a girls rectum and is smelt by the man doing the girl from behind in the classic doggy position
TIM: "Dude, Zoe had the worst smell coming from her ass last night when I was doing her doggy style, it was the smell of sweat and poo"

JIM: "Yeah man, thats a stink riser you had there!"
by lentonlads December 12, 2009
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