Then I'm finna exit wit' your ex and her BF to F, uh

from C.O.B (Ft. Coniyac DA X.O, Horseshoe G.A.N.G, Iceman, Karelezz, One Two, PWT & Tim West) – C.O.B Cypher 2011 Lyrics on Rap Genius

Meaning

He’s gonna take your last bitch and her bestfriend (BF) and the three of them are gonna fuck (F) also a play on BFF (Best Friends Forever)

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