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Accepted meanings:

1) A by-product of carbon manufacturing; Of or belonging to carbon.

2) Star Wars reference; To be frozen. Also 'cold', 'cool' and other synonyms.
Cold as carbonite;

A carbonite rod;
by TheMeaningOfLife September 03, 2003
People who love to play Need For Speed Carbon racing game. Not just anyone can be a carbonite....you need to really love the game to be one. Game found on Xbox 360 and other consoles
Shoune is a carbonite he plays that game all the time.
by bub-a-licious March 23, 2009