A person that has a beer belly but has no butt
That person has a strange figure, it looks like a reverse-butt; a flat ass with a beer gut.
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To fill your mouth with alcohol, then blow the alcohol through a tube into a person's ass. Then suck the alcohol back out of the person's ass.
Man I totally reverse butt chugged out of your girlfriend's ass last night, and I got fucking smashed!
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smothering someone, using your own butt
I'll reverse butt-rape you in the face if you don't stop!
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3 dudes are required for this venture. 2 receive cum in the bum bum then you attach a 3-way straw and whoever of the 3 pulls the shortest straw gets to suck the cum from both bungholes at the same time NIE NIE NIE!!!!
Oh yea, I'm going to my brothers for a reverse butt fetch session Definition: Reverse Butt Feltch, (an act of Sodomy mixed with sweat and bodily fluids)