Verb: The pathetic version of striking fear into the hearts of others. Though, if someone says it before beating the shit out of you, you get a good laugh before your face is pounded in.
"Police say that before the man was shot to death, he said 'rawr' out loud. Ironically, 'rawr' is a codeword for 'kill me' when in that specific gang territory."
A word with sever meanings, varying from person to person. My personaldefinition is that it's a synonym of avast. Otherwise, it's a synonym of 'roar', and is often used to signal displeasure.