You shitted on me on your way up, it's 'bout to be a scary drop
Cause what goes up, must come down

from Bad Meets Evil (Ft. Bruno Mars) – Lighters Lyrics on Rap Genius

Meaning

“Be nice to those you meet on the way up because you will meet them on the way down” — Jimmy Durante

In this case, Royce’s competition is about to fall beneath him and get shitted on just like he did

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