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When the female stuffs her finger into her box, then pulls her finger out and wipes it across your lip.

Similar to the dirty sanchez.
I stuck my finger down my wife's butt crack and wiped it across her lip and yelled "DIRTY SANCHEZ!", which she responded by sticking her finger in her box then wiping it on my lip and yelling "DIRTY SANDY!"
by Electric Mayhem November 11, 2004
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Getting your hand wet dipping it in sand then jerking off your man
Dude I heard Taylor gave Brian a dirty sandy at the basketball game.
by Plebcicle February 24, 2017
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