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Arabic origins, other dialects pronounce it magnoon, it literally means "crazy" as in mentally ill, but has been extended in the vernacular to include something that's fucked up, crazy, or unbelievable.
Did you see the crane falling from the roof? That shit was majnoon!


That bitch is majnoon, running around the streets yelling expletives at random strangers.
by ShayaKNYC May 05, 2008