It's going down on sight
I'm always down to fight
Ain't duff a nigga in the while, no bluff

from Joey BADA$$ (Ft. Kirk Knight) – Where It'$ At Lyrics on Rap Genius

Meaning

As soon as he see the nigga saying shit or “running his mouth” he is going to go down on that nigga(fight) because he doesnt need to hear there bullshit.

He finishes by saying he “aint duff a nigga in a while"
Meaning its been a while since hes beat a nigga since hes been busy with his music

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