As if, I'mma let you niggas style on me

from Jay Z – Reminder Lyrics on Rap Genius

Meaning

Jay-Z is not going to let any other rappers fuck with him.
Could be alluding to the infamous Nyckz vs. EnJ Freestyle Battle:

“Oh you mad cuz I’m stylin' on you.”

http://www.youtube.com/watch?v=Yg6SLuxtCvw

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