Yes, I am aware of that. When I moved to Tennessee the usual "thank-you" was a bland "uh-huh."
The other funny Americanism for me is "y'all" when you are referring to only one person. Do you know the correct versions for singular-possessive, plural, and plural-possessive?
Further, when I was on Travel Duty I was on "TD," but my American colleagues were on "TDY." I was told the "Y" is for "Y'all."
I was sent on TDY (Temporary DutY) assignments.