I fuck over you like I'm sexin' on the top bunk

from Birdman (Ft. Lil Wayne & Mack Maine) – Always Strapped Lyrics on Rap Genius

To fuck someone over is to do them wrong. Mack is going to mess you up.
To fuck over someone is also like if you have sex in the top bunk while someone is in the bottom bunk. This happens very often in college. That’s why it’s best to get the top bunk before your roommate checks in.

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