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carb

What does carb mean?

A small hole (carburetor) on a dry pipe that the smoker covers while lighting and releases to clear the smoke through in a rush.

"Cover the carb while you light it, then let go to pull the hit."

Origin

Short for 'carburetor', by analogy with an engine's air-fuel mixing.

Frequently asked questions

What is a carb on a pipe?
It's a small hole on a dry pipe that you cover while lighting and release to clear the built-up smoke through in a rush.
How do you use the carb?
Keep a finger over the carb while you light and draw, then lift your finger to let air in and pull the smoke into your lungs.
Why is it called a carb?
It's short for carburetor, by analogy with how an engine's carburetor mixes air and fuel.
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Slang definitions: FreeDict original editorial.