Over the last 10 years or so, I’ve noticed Americans using the British phrase “spot on” to mean “exactly right,” “accurate.”
I’ve also heard the word “bum” in place of “posterior” or “fanny.” (The other day at the doctor’s office, the assistant told me to move my bum down the chair.) Here it used to mean just a hobo.
I use bum over butt—it was passed down from my English mom. She’s been out of England so long though, she isn’t familiar with most of the British slang words they use now.