I drop your set for rep

from Jay Z – Breathe Easy (Lyrical Exercise) Lyrics on Rap Genius

Meaning

In exercise slang, a “rep”, is one repetition of an exercise, and a “set” is a number of reps performed consecutively

In street slang, “rep” is short for reputation, while “set” is slang for gang. To drop (kill) someone’s gang would earn you a reputation

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