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Mr. Steal Yo Girl. This is usually a male of any age who is infamous for hooking up with/seducing/causing the break up of other guy's girlfriends/wives. Mr. Steal Yo Girl is almost always in denial and will project his MSYG title onto others, particularly close friends. Recently, mathematicians have derived a formula to calculate MSYG status: MSYG= (# of Girls Stolen)^2*(Number of Times Stolen/Girl)
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