a sight-seeing motor coach
Pronunciation:
SHAR-a-bang
In a sentence:
Stepping into the charabanc, Lydia realized that despite what her fiancee had promised, this was just going to be another two weeks in American tourist hell.
In a different sentence:
Listening to their rambling tour guide while sitting in the back of a charabanc in Amsterdam, Bob and Rita realized that they were finally old and boring.