Hello

Kat is expressing how someone used to try to sell false dreams when she was young. most likely how boys tell girls all sorts of things just to get with them. Dreams like "i know somewhere we could go" As if he could offer her a place out in the world full of fun and luxury. She is shouting "HELLO" meaning: wake up dumbass, im not that nieve anymore to believe in the dreams your trying to sell me. " Go Shove yourself" means Get Lost.. or go fuck yourself. Get away from me go show yourself a goal..

This is one meaing of the song....

The other meaning is a little deeper. She could be recollecting her youthful conscience by confronting the person she is today. How we dream as children of being stars "We care lot about a big situation When we were young"

Alot of times after rockstars make it big they realize being famous is not all its cracked up to be.

" I know somewhere we could go, i know someone we could be" This appears to be her aspirations at a young age before becoming famous.

Now that she has become what she wanted to become, she is sick with it and dosnt want it anymore. "I am the worst one yet"

I Luv this song, it seems really full of sexual energy especially the chorus...hence why I dont get why anyone would think she means 'hello' in the sarcastic sense...like if you listen to the song the way she screams hello is supposed to sound almost orgasmic so I dunno wat the first commenter had in mind...