Why you all up in my mouthpiece, trying to get something up out me
I done met bitches like you before, I treat them like a no no

from Lil B (Ft. Bitch Mob) – Task Force Lyrics on Rap Genius

Meaning

He’s talking about people (mainly bitches) that are in his mouthpiece (face) and are trying to get info out of him. But he’s already met people like them, so he treats them like a no no (something you want to avoid).

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