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To annihilate or destroy. To Fuck up. To devour or "tear up."
Hey, ain't that the nigga that stole D's ipod?

Yeah, lets mash on this nigga!
by cbowling September 15, 2009
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To destroy a women's vagina, He pleases every women that he has intercourse with
Zendaya said that this guy Mashon'd her last night
by Mashon August 12, 2017
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