Top Definition
Masturfarting, as opposed to its also popular brother activity, Farturbating, is when one engages in the act of masturbating while they pass gass. The order of these activities is crucial : If you are gassy (i.e. farting) and you elect to masturbate, you are masturfarting. Congratulations.

For disambiguation, see FARTURBATING, and the sister activity, QUEEFURBATING
Ron: "Why does it smell so weird in here?"

Dave: "Sorry, Ron, I was masturfarting. That should explain the smell, and the residue on your sheets."
by FarturBATing September 26, 2010
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