She's so much better than my old bitch
Man, I love that old bitch, I do

from Big Sean (Ft. Juicy J & Nicki Minaj) – MILF Lyrics on Rap Genius

Meaning

Big Sean’s old bitch, is no good compared to the MILF that he is currently having affairs with.

The last line is a reference to marriage, which almost certainly Big Sean will not follow through on.

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