To pleasure one's mouth by noisily smacking and popping one's gum. Often done in public.
One should mouthsturbate in the privacy of one's home only.
by GentleReader July 10, 2008
1 more definition
When a man puts his penis part way into a woman's mouth yet continues to pleasure himself manually till he shoots manchowder down her throat.
Kelly had to mouthsturbate her boss to get a promotion.
by WhiteRussian3 October 10, 2011