cheers
Used often by Brits in different contexts, look at the other definitions posted by others.

Also used by Canadians and Americans, sort of as a way of saying "Thank you and have a nice day" or can just be used as "see ya" or "Thanks."
Server at a store or restaurant: "Here's the *product* you asked for. Anything else?"
Customer: "No, that's all, thanks."
Server: "Cheers."
Customer: *leaves*