A person who always delivers the goods. If they say they are going to do something they do. Rockstars tend to downplay their success and don't like the attention. They simply deliver consistent results.
This word is the antonym to and should not be confused with a Crockstar, who just talks big and doesn't deliver shit for results.
also, sometimes... They sleep with their jeans on.
Vince Neil: I AM NOT A ROCK STAR!!! (as he throws down his microphone and stomps offstage in a fit of pique).
Example: Craig Nicholls From The Vines is a rock star.
All Hip hop, R'n'b etc artists are NOT rock stars of any form. Just Ugly little boys/girls trying to be cool.
Example: Snoop Dog is NOT a Rock star.
In urban circles, it is an informal title used to publicly express strong intentions towards future commitment in a relationship.
A Rockstar is a rare hybrid breed of man that is reliable, trustworthy and exceptionally handsome while also being great craic.
It is generally considered a great honor and a big deal to be given this title by a ghetto girl.
"I dunno about that, I'll have to check with the Rockstar."
"Sorry lads, not out tonight, I'm hanging out with the Rockstar."