And would get up in that ass but the fag's might bust

from Joe Budden (Ft. Crooked I, Joell Ortiz, Nino Bless & Royce Da 5'9") – Slaughterhouse Lyrics on Rap Genius

Meaning

It’s an insult hidden in the alleviation of a threat. He’s saying under different circumstances he would “get up in that ass” (cause a fight) but at the same time dispelling that and calling the person in reference homosexual

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