So you wanna be hardcore
With your hat to the back
Talking about the gats in your raps
But I can't feel that hardcore
Appeal that you're screaming

from The Notorious B.I.G. – Machine Gun Funk Lyrics on Rap Genius

Meaning

Biggie dedicates the first verse to dissing some unnamed rapper who emulates a gangsta in appearance but not in criminality. Biggie, presumably a real criminal, chides this coward for merely talking about guns without bothering to squeeze the trigger

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