But I and her know that they can't fade this
Cause I'm doin my own thing down with the swang

from Dr. Dre – Bitches Ain't Shit Lyrics on Rap Genius

Meaning

She is proclaiming her lyrical adeptness is untouchable (can’t fade this) because she is being honest (doing my own thing) and is an amazing musician (down with the swang)

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