I like the word "cheers". It's what we say when we are having a drink with friends and raise our glasses before we take the first sip.
Nowadays however, many people have replaced "thanks" with "cheers". I find it quite annoying.
- A: Here's the newspaper. I've finished reading it. B: Cheers!
- A: You can sit here if you like. B: Cheers *mate!
*Mate is an informal word for friend. What is even more annoying is when people call someone they hardly know, or even complete strangers, mate.
Having said that, flatmates, classmates and workmates (colleagues) may not be your mates either.