Sticking your finger(s) in or around your anus, just enough to get a poop smell on it. Then, putting your "stink finger" up to someone else's nose, forcing them to smell the poop.
My wife came up to me when I was lying on the couch, and farted in my face. I ran after her, and gave her the stink finger.
by corky January 14, 2005
The (usually) surreptitious action of savoring the pheremone laden evidence of digital exploration of that magical female orifice. Commonly discovered by young men driving home after a date involving second base. Enjoyable at any age. Often characterized as a game.
“Frankie had himself a good game of stinkfinger all the way home from his date with new girlfriend.”
by Frankie February 05, 2004
The aroma left upon one's fingers after insertion into a woman's vagina during sex; implies lack of proper hygene, not on the part of the person achieving "stink finger," but on the part of the woman involved.
I had sex with Vicky last night and left with an amazingly pungent case of stink finger.
by goblineyes December 09, 2003