Green’s Dictionary of Slang

(US black) a Lexus motorcar, one of the high-status cars preferred by the rap/hip-hop community.

1997		Eble Campus Sl. Fall 5: lex – abbreviation of the car Lexus: ‘Stackhouse was chillin in a lex’.
2000		W. Shaw Westsiders 231: ‘So you’re not in the ’84 Caddy any more?’ Khop laughs. ‘Changed from a ’Lac to a Lex.’.