Although many countries do speak English, there are some differences between the meaning of the same words. Here are a few:
Calling your butt a fanny isn't okay
"Fanny" is a colloquialism for the female genitalia, but not viewed as extreme as the c-word. "Bum" is acceptable slang for the posterior, roughly equivalent to butt.
2. Don't comment on our pants!
"pants" usually referred to underwear in the UK - not trousers.
"pants" used also when referring to something that is/was not good e.g the film last night was pants.
3. Referring to a person as "so full of spirit and spunk" isn't ok.
“spunk” is a colloquialism for ejaculate (noun, not in the verb form).
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