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1) When a person acts as though they are more important or better than everyone else in a public place.

2) Doing something which makes you the center of attention to all those around you.

Often involves wearing sunglasses indoors or at night.
- Dude, Daniel was totally rock starring last night!

- I know man, I can't believe they let him get up on the bar and take body shots out of the waitress' chest!
by DMacklin June 22, 2009
A douchebag trying to look like a rockstar or celebrity by wearing sunglasses indoors or at night.
I'm at the club Rockstarring with my shades on.
by redditguy2012 October 09, 2011