I could check out of this muthafucka with no regrets

from Big Sean (Ft. James Fauntleroy, Kendrick Lamar & Royce Da 5'9") – 100 Lyrics on Rap Genius

Meaning

He’s using wordplay (homophone) with the line before saying if he got a “check out” of rapping (like money) big enough to pay for his kids then he would “check out” (retire) because that all he’s doing it for as he says in the next line.

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