When did “WTH” become “WTF”?
When social graces dropped far enough for “F” to be more common than “H.”
OMFG ! IMHFO, it’s a disgrace. A disgrace, I tell ya
Substituting “fuck” for “devil” or “Hell” in an expression such as “what the ____” or “why the ____” can be traced back in print in English to 1864. They actually used the word puck .
The first appearance of fuck in such an expression in print was 1934. But still not in polite society or literature. It took until the early 1950’s for that.