Green’s Dictionary of Slang

(US black) small, little.

1908		Sun. Times (Perth) 11 Oct. 1/1: These ti-ti brigands received healthy smacks on the jaw from the followers of the apostolic calling.
1982		(con. 1970) J.M. Del Vecchio 13th Valley (1983) 258: I don’t want to get dogged down on tee-tee caches, while they snipe us to pieces.
2000		Ebonics Primer at www.dolemite.com 🌐 ti-ti Definition: something small or lil. Example: Man dat nigga be sellin some ti-ti ass sacks.