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The bonding or fusion of ass hair and underwear after an "accident". This occurs after sitting for a long time and the shit dries like glue. A rare experience, but can be very painful.
I had a bad ass fusion the other day when Delta lost my fucking luggage and I was stuck in the car.
by climber clown August 06, 2015
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2
Fusion of such fine ass that it makes dividing by zero child's play.
Dat ass be so fine, I would like to perform ass fusion to make a child cry due to masses of asses.
by Nigger Joel April 14, 2014
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