I snuff you from behind, punk, uff you frontin’ Thank me later

from Slaughterhouse – Funkmaster Flex Freestyle Lyrics on Rap Genius

Meaning

He’s going to blow your brains out from behind. “Uff” being the reverse of fuck (like “ish” in place of “shit”) which you can’t say on the radio. “Fuck ya frontin'” is also a multi sylable rhyme with “Sucka punchin'” used in the line before.

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