Depends, mostly some inarticulate squeal or something like "FUCK YEAH!!!!" if I'm in my car.

I have a coworker who, anytime one of the popular angry-rock bands he likes comes on the radio, will generally shout "GET IT!" I have come to love this expression.

Get it!

I start hopping up and down like a cranked-up geek on a pogo stick, yelling "Hey everyone! Hey! Listen! It's my song! My favorite song is here! Listen! Hey! Listen with me! Now! Do you listen? Hey!