What is the X in X-mas?
abbreviation for personal computer is from 1978; abbreviation for politically correct is by 1990.
Latin post cibum (after meals)
An abbreviation for “politically correct.” It refers to social, political, and educational changes designed to redress historical injustices in areas such as race, gender, ethnic background, and sexual orientation: “Haven't you read the latest directive on p.c. language? Please refer to our colleagues as ‘women,’ not ‘ladies’ or ‘girls.’” The phrase and abbreviation, which also appears as PC, both debuted in the late twentieth century.
(also pc) Exhibiting political correctnessnoun