After reading a few threads recently in which I was momentarily thrown by the different meaning for a commonly used word, I thought that it might be something that we can explore and ask each other for the regional/country variations.
My examples:
1) Tailgating - in Australia this would mean some-one who is drving right on your tail "he was tailgating me all the way from the traffic lights". I understand in the US this is when you have a BBQ around the back of the car in a parking lot, usually at a sports stadium. Please correct me if I'm mistaken.
2) Flu, or more specifically stomach flu. In my area we only use the word flu to describe influenza (well some people call a cold the flu but we won't worry about them

). I've recently seen some-one here call a stomach issue a stomach flu. We would probably either call this a stomach bug or gastro (short for gastroenteritis). I am making an assumption here of course that the person using this phrase didn't mean the flu with some vomiting. Can anyone shed any light on this one?
Your turn now. Have you seen any words used completely differently to how you understand them that has thrown you for a moment?