RAWK is the slang spelling of ROCK, originally used by metal fans.
Quite often, it's used to parody (and self-parody) the hard-core fan.
rawks my sawks!
rawkus! (used like awesome)
rawkfist ("rock fist" - forefinger and pinky straight up and your other fingers down, with your thumb over them)
Rawk usually used to refer to bands like Skillet, Family Force 5, and Hawk Nelson.
It is also the way Thousand Foot Krutch spells it in the song Rawkfist.
I listen to rawk and I'm proud of it!