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.
Guy2: Aw dude that means she plays CoD.
by Supercoke November 19, 2010