I know you've heard I'm a gangsta
They say "Stay away from them gangstas"
They never change up, or pull they pants up

from Beyoncé (Ft. Jay Z) – That's How You Like It Lyrics on Rap Genius

Meaning

Jay raps that other people are telling Bey to stay away from him because he is a gangster and she is too much of a good girl for him.

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