When the pressurized air that comes out of your tush, while sitting on the toilet, is so great in quantity and stature that it literally lifts you up off of the commode.
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buttocks,tush,rocket,butt,firecracker,deadly weapon,weapon,missile,intercontinental ballistic missle,butt-rocket
My roommate was walking by the bathroom, heard a loud noise, and said, "Oh my god!" Then I responded, "Yeah dude, I just had a butt rocket!"
by little_girls_fart_too November 03, 2008