I put Monie in the middle
Where she at? In the middle

from Kanye West (Ft. Elly Jackson, Jay Z & Justin Vernon) – That's My Bitch Lyrics on Rap Genius

Meaning

A reference to Monie Love’s song of the same name. Ye’s not putting his “money between him and the girl. Kanye’s putting his "money” in the middle. i.e. in between the this girl’s thighs. Continuing the “Monie in the middle” chorus, ‘Ye asks — and responds “where she at? In the middle”. Now she’s trying to get in between Kanye and the literal money. A sentiment he’s expressed elsewhere.

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