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Like a guitar, anal acoustics is caused by a loud sound erupting from deep within, forcing the sound out of the nearest exit, which then causes your body to perform anal acoustics. (results may vary.)

Another word for Fart.
Epic Dude #1: Dude! Donny stinks really bad!
Epic Dude #2: Ya, he's rockin' out some anal acoustics man!
by Oh, This Guy Is Good February 12, 2010
a synonym for "fart"
Sandra let out some nasty anal acoustics.
by foshizz June 23, 2006