Nowadays, niggas are killas on the beat
But where I was raised all of the killas was down the street

from B.o.B – Play for Keeps Lyrics on Rap Genius

Meaning

He saying rappers claim that they so hard or they’ll kill anybody no questions asked when really they aren’t because he know people from growing up who would really kill.

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Nowadays, niggas are killas on the beat But where I was raised all of the killas was down the street

Nowadays, niggas are killas on the beat
But where I was raised all of the killas was down the street