A word used to make people fear something. Although it doesn't work most of the time most people understand that you are trying to make them fear something.
Ranwr is sort of a way to say "hey", as in "hey, what the hell?" in a fun way. It is a fun thing to do and is very entertaining, it is easy and fun and will annoy the shit out of your friends. "Ranwr" sounds like a cat screeching, not meowing. It can break an awkward silence and make the conversation better, it adds humor.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.