Green’s Dictionary of Slang

(US drugs) a runner for a drug dealer.

1995		S. Moore In The Cut 98: I have new words for the dictionary. [...] scrambler, low-level runner for a drug dealer.
1996		Nas ‘If I Ruled the World’ 🎵 You’d love to hear the story how the thugs live in worry / Duck down in car seats, heat’s mandatory / Runnin from Jake, gettin chased, hunger for papes / These are the breaks many mistakes go down out of state / Wait, I had to let it marinate we carry weight / Tryin to get laced, flip the ace stack the safe / Millionaire plan to keep the gat with the cop camera / Makin moves in Atlanta, back and forth scrambler.