Top Definition
Pronounced (mass-tur-fart)

Simultaneous masturbation and flatulence
Tony says: Hey Jerry there is semen all over the side of the couch and it stinks in here.... Have you been masterfarting?

Jerry says: Yes I just had a solid masturfart session.... Sorry about your mums couch
by Schlumo Gligpuppet October 31, 2010
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