Green’s Dictionary of Slang

politically correct, ideologically pure.

1989		Kirk & Madsen After The Ball 302: In a community in which every gay wants to be ‘p.c.-er’ than thou.
1999		Indep. 12 July 20: Not a dictator with a PC conscience either.
2003		McGill Reed Dict. of N.Z. Sl. 154: PC Politically correct, the right way to behave at present, eg, ‘Tim is one PC Pakeha, always has to say kia ora when he meets you.’.