Green’s Dictionary of Slang

(US black) Compton, Calif.

1990		N. George ‘CPT Time’ in Buppies, B-Boys, Baps and Bohos (1994) 58: The city of Compton, known as Comptown or CPT to its younger residents.
1995		L. Stavsky et al. A2Z.
2014		C. Eble (ed.) UNC-CH Campus Sl. Spring 2014 3: C.P.T. — <colored people’s time late. Seldom used even jokingly in mixed race student groups.