Aiming your ejaculate at the mattress instead of releasing it inside of a female, thus risking impregnating said female.
Lebron James' father should have performed mattresscide instead of bringing that useless human into the world.
by BLKJAK June 16, 2011
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All of the dead skin flakes, dirt, dust mites, and everything else that accumulates inside a mattress over the years.
by Lemonheadlice July 21, 2010
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