1. A person who parties harder then anyone at an event where drinks are in red party cups, ex college party, house party. Someone who always seems to show up when the party is started, because they themselves bring the party with them. Girls want to be with them, guys want to be them.

2. A song by rap group Greatness & Co. who coined the term.
Hater: "That guy is an asshole. He just stole my girl."
Girl: "She wasn't even with you, and he is way cooler. He is a red cup rockstar."

Fan: "Hey have you heard that new G&C song? Its called Red Cup Rockstars. I want to play it at our next party."
by Polzin July 27, 2009
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