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Anal Vacuum 

Where you put your mouth on someones asshole and start sucking until you eventually suck a fart out of their ass.
I heard that your mom likes to give every guy that shes with an anal vacuum.
Anal Vacuum by SePhIrOtH6969 May 28, 2006

anal vacuum 

the act of sucking ones asshole until either a fart or feces comes out.
Jim gave me an anal vacuum last night and it cleared my constipation