But I bust heads for real, go head --

from Ab-Soul (Ft. Black Hippy, Jay Rock, Kendrick Lamar & Schoolboy Q) – Black Lip Bastard (Remix) Lyrics 5 on Rap Genius

Meaning

He says “Go ahead” but pronounces ‘ahead’ as ‘head’. It’s a whole bar on busting head puns.

Also note that when he decides to speak truth it gets COMPLETELY censored out!

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