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the act of taking a real fizzy type of beer and opening it carefully 'usually in a bottle', and ramming it into your partners ass then shaking it up to cause the beer to explode rushing out the sides of the asshole causing a gushing effect this can also be called NIAGRA FALLS,BEER SPRING,or my favorite TH BEER GYSER
dude i suprised her with a beer butt gusher last night she was pissed
by dick up ass November 04, 2009
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