When you are doing a girl up the butt and she farts so that her butthole moves around or vibrates when your penis is still in it so that it stimulates it and forces you to ejaculate all over the place.
by Cracker Jack January 17, 2005
anime, great in jap w/swearing and blood ('xept high pitch male voices!) but crap once edited by gay tv fag assholes
by cracker jack April 26, 2003