Cause I'm a writer -- you hate on me, I get Bieber beefing
Up on a pop song, a top 40 hit

from Emilio Rojas – Stay Schemin Freestyle Lyrics on Rap Genius

Meaning

Rojas claims he has ghost wrote on many popular songs on the radio.
If you fuck with him, next thing you know Bieber will be singing diss tracks at you.
You don’t want that.

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