What is I got the horses in the back?

The song 'Old Town Road' has a line 'I Got Horses In The Back', normally used as a meme.

Dunkan: Hey Frank, where are the horses?
Frank: I Got The Horses In The Back
Billy Ray Cyrus: Horse tack is attached
Lil Nas X: Hat is matte black.
Dunkan/Frank: The hell?

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I got the horses in the back - video