Green’s Dictionary of Slang

(orig. US black) wait! stop!

1989		(con. 1982–6) T. Williams Cocaine Kids (1990) 119: We had been selling good about three hours when this kid comes up and says he wanted some weight. So, I said chill, and I called Chillie over and he said okay.
2000		(con. 1940s–60s) Décharné Straight from the Fridge Dad 31: Chill Stop that, wait a minute.
2012		‘Dutch’ ? (Pronounced Que) [ebook] ‘Yo, B, chill!’ KG hollered.