Top Definition
mr steal yo girl
msyg is short from its mr steal yo girl from bottoms up from trey songs
by msyg October 13, 2010
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)
Mike- Hey dude, Donald keeps eyein' my girl, I don't like it.

Ryan- Yeah man, he's widely known as MSYG.

Kyle: I wanna go make moves on Pam, but I think Donny might be tryin' to hit that.
Ryan: Nah man, Pam's single, Donald is MSYG.

Donald: That's BS, I am not MSYG, you are!
by ElDoctorRyan February 21, 2015

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