Green’s Dictionary of Slang

1. (US gang) an informer.

1998		Mayor’s Anti-Gang Office City of Houston, TX Street Gang Sl. / Gloss. 9 Nov.: hater A snitch.
2001		Source Aug. 191: [His] work was built on bustin’ the balls of busters, haters, rivals and, er, bitches.

2. see player-hater under player n.