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3.
resulting buyers remorse that ensues from purchasing a carbon fiber body part for an automobile that is expensive to the buyer, with the buyer soon realizing that said part has no effect on increasing performance /speed /power of said automobile.
guy1: I spent all my paycheck to install a carbon fiber hood, but i ain't seeing any difference.
guy1: Man ... i got serious carbon guilt.
guy2: Didn't I tell you to buy the Turbo Kit instead??? Dumb ass!!!
by gearbox360 August 24, 2008
 
1.
The horrible guilt a generally green-minded person feels when they have no choice but to do something entirely unsustainable.
"I am so racked with carbon guilt-- my company is making me fly half way across the world for a 2 hour meeting!"
by Andrea Fernandez June 19, 2008
 
2.
A fad term that retards feel when they put any amount of Carbon Dioxide in the atmosphere, such as when breathing (because exhaling does put carbon dioxide in the environment), something that the world's plant life need in order to survive anyway. This in turn will cause millions of people to get worked up on something completely stupid and ridiculous while the wealthy elite that pushes this fear and guilt on them relaxes in their life of luxury and hypocricy.

Meanwhile countless people are starving while we attempt to convert obscene amounts of corn into a gallon of ethanol fuel, and other retarded contraptions.
A: "Hey did you know breathing creates carbon dioxide?"

B: "And carbon dioxide will destroy the planet and everything in it! Let's kill ourselves, i am getting so much carbon guilt now."

A: "Ok."

/Kills themselves
by gangrenous khan July 10, 2008
 
4.
The feeling of guilt for using too much carbon,
e.g. too much air travel,
driving to the corner shop in the car, etc
'Man, I have to fly to Zurich for the second time this month'
'Whoa, you must have some major carbon guilt over that'
by jenngirl August 29, 2007