TIL "In Boston in 1830, the craze was for mis-spelling phrases, then using the mis-spelled initials in speech. Only those in the know would get it, which was of course the whole point. So, for instance:
KC stood for ‘knuff ced’ (enough said).
OW stood for ‘Orl Wright’ (all right).
NG stood for ‘no go’. SP stood for ‘small potatoes’, and so on.
Two hundred years later, only one phrase has endured:
OK stood for ‘oll korrect’ (all correct)."