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The Sour Sloth is the sexual act of taking your girl from behind, fucking her hard enough that she walks slightly bent over afterwords. The sour part comes next(and also on her face), Simply bust a nut into her nostrils right before she asks to cuddle. Thus; she sluggishly wanders like a Sour Sloth to the bathroom to get cleaned up.
Person 1: My girl and I decided to experiment with different kinds of sex acts last night. Person 2: Oh yeah? Cool. What'd you end up doing? Person 1: She got kinky so I decided to turn her into a Sour Sloth.
by Heisenbyrge II May 13, 2016
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