I'm 'bout to give it back to my nigga Bus-a-Bus
And have a seat, it's convenient I'm already copping a squat

from Royce Da 5'9" (Ft. Busta Rhymes) – Dinner Time Lyrics on Rap Genius

Meaning

Buster Rhymes is about to come on the track with the second interlude, so Royce is going to sit down.
Royce says “it’s convenient I’m already coppin' a squat”(meaning he is already sitting. He also means that he is staying where he is in the rap game.

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