A person who will randomly add themselves to your conversation. Can also be used as a verb.
"God, Katie's such a chime"
"Chime out please, Nikki"
The biggest hole known to man. Even the politicians don't stay for long, and no one outside of Australia knows that it exists.
Guy 1: Dude, I'm going to Canberra this weekend.
Guy 2: WHY?!
Guy 1: They're having an Impressionists exhibition.
Guy 2: Why don't you just save up and go see it in Paris?!