1 definition by Arntnok

when one engages in the touching of oneself at a time when one's significant other is right beside them.

the monster replaces master because one who subjects themselves to such acts are obviously dirty pigs.
olive engages in monsterbation 24/7, even when he has just 69ed with the finest bitch, hence he is the ultimate perve who no one likes.
by Arntnok February 2, 2008
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