Green’s Dictionary of Slang

1. (US, also teech) teacher.

1947		I. Shulman Amboy Dukes 51: Hey Teach [...] you’re a regular Sampson.
1949		J.H. Burns Lucifer with a Book 69: Kids, let me introduce Miss Blanchard, our new teach. [Ibid.] 124: You wanted me, Teech?
1955		E. Hunter Blackboard Jungle 82: ‘Think you’ll make it, teach?’ West asked.
1961		F. Kohner Gidget Goes Hawaiian 79: How about it, teach?
1976		R. Sabbag Snowblind (1978) 94: Twenty dollars a key, teach.
1979		H.C. Collins Street Gangs 224: Teach Teacher.
1990		S. Morgan Homeboy 5: His fourthgrade biology teach was another Rosemary.
2005		E. White My Lives 234: One day T burst into the filthy, shit-streaked [...] toilet and started fucking Teach’s face.

2. (US black) anyone considered intelligent or intellectual.

1972

D. Claerbut Black Jargon in White America.