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A beverage without the caffeine, alcohol or sugar removed.
Would you like a diet coke? No thanks, I'll have the high octane.

Coffee shop clerk: Decaf espresso today?
Customer: Nope, high octane.
by Nitrotc May 22, 2007
forceful, powerfull, energetic
They chose to run the high octane race.
by Light Joker June 25, 2007