I used to think that it was a phase teenagers went through, seeing sexual innuendo in absolutely everything, interrupting every conversation to snigger and repeat a word that sounded naughty to them.
But I'm at home with DP, who is non-native English speaker. He's collaborating on a document written in English by various Europeans. The one UK member of the working group has written "WTF!" because someone else used the word "posterior", as in "afterwards". The person who used the word "posterior" is wondering what's wrong.
I came across this "fnarr-fnarr" behaviour on Mumsnet once when I made the mistake of using "escort" in a title, and then made it worse by using the word "egg" in the same title. I flounced eventually, after the sixtieth person didn't read the full thread and told me I was being unreasonable and had deliberately misled them by using such words. OK, that was an internet forum. No big deal. But this is supposed to be an adult; all the other adults are using his native language, and he can't manage to behave like an adult, and it's really winding me up. Is this just a UK thing?