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Rockstar is a line of energy drinks that come in a variety of flavors and types such as:

-Rockstar Energy Drink (black can)
-Sugar Free Rockstar Energy Drink (white can)
-Rockstar Juiced (orange can)
-Rockstar Juiced Pomegranate (red can)
-Rockstar Zero Carb (blue can)
-Rockstar Juiced Guava (purple can)

There are also alcoholic versions of the brand including Rockstar 21 (only alcoholic version sold in the US), Rockstar + Vodka and Rockstar + Vodka/Pomegranate.

The star in place of the A is complete marketing also. Not only does it enhance the overall appearance of the line of drinks but it also appeals to 1337 speakers.

Its slogan is "Party like a rockstar".
Ugh, another dreary Monday. I really need a Rockstar.
by Sid Barrett September 03, 2007
Simply the most delicious, addictive, and energizing substance on Earth. It's pretty much liquified crack in a can.
I haven't had a Rockstar in three days and I need a fix real bad.
by Disasterpiece March 01, 2008
A person, male or female, devoted to a life of rocking.
Generally seen donning Def Leppard or AC/DC shirts.

Oft times seen with a banada securing down the top half of a mullet.

Likes Bitchin' Cameros.

Patiently waiting the day when he/she will take the stage and no longer be a roadie.
Oh.....he/she looks like a rockstar.
by sweetdelilah June 14, 2004
Keith Richards.
Avril Lavigne is not a rock star. Keith Richards is. (:
by HazardousKid December 01, 2009
1. A game developer known for its kick ass games such as: grand theft auto, red dead redemption, midnight club, etc.
2. Someone who is more focused on partying than anything else. Known to take heavy drugs such as weed, acid, coke and crack.
3. An energy drink that kicks ass.
1. I just bought grand theft auto 4, a game made by rockstar.
2. That rockstar never knows when to stop.
3. I just got wired on rockstar energy drink.
by ironmaiden8667 June 16, 2010
Being true to ones self and their very nature; Living without limitations or restrictions to ones obsesions. Freedom.

Someone who is Living the Life You Want to Live and doing things you can Only Dream About. The Person you want to be, or dream about being.

A Rich guy who's "Too Cool To Hate"...
Charlie Sheen, Steven Tyler, Nicoli Tesla, Bob Dylan, and Bill Gates are Rock Stars.
by Linus T August 28, 2011
Rockstar is without a doubt the best makers of videogames out there. Of course, they're the makers of the beloved Grand Theft Auto series, but they make other great ones as well... I think their best work is seen in Red Dead Revolver. Rockstar aint never gonna care about what fuckers like Hilary Clinton say.
Lets pray to the game gods that Rockstar Games is never bought out by EA!

by Rockstar is the best July 15, 2006