Nope! Mr. Yaowa, yup! 'Bout to go meat fishin
And catch me a crevice, I'm back on the asscheek mission

from Slaughterhouse – Cuckoo Lyrics on Rap Genius

Meaning

Mr. Yaowa = Joell Ortiz
Yaowa is his catchphrase (battle cry, of sorts)

He’s using his “meat pole” in hopes to catch a crevice (small opening)

He’s lookin' for some women to fuck

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