Quote Originally Posted by beavermint64
sorry but what is a carb lol im dumb

the hole that you have to cover, and when you take your finger off, it allows air to enter the chamber, and thats how you clear all the smoke out.

Or, if you have a bong with a slidding bowl, you can fill it through there, and thats also a carb.

Pretty much a carb is anything that allows air to enter the chamber of the piece