A yelp or shout on Modern Warfare 2 yelled by the Terrorist team to proclaim dominance; Means enemy down in Arabic; Related to the world Moggdy Bossen.
Guy: Dude, I think my GF is a terrorist, every time I give her a chunky fister she yells Mahija Mossen!

Guy2: Aw dude that means she plays CoD.
by Supercoke November 18, 2010

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