And then take that finger off of that hole
Plug it, unplug it, don't straaaain

from Cypress Hill – Hits From the Bong Lyrics on Rap Genius

Meaning

A bong has a little hole (often called a “carb”) which you cover as you draw smoke through the water; then uncover to let fresh air rush in and carry the smoke through the bong, past your trachea, down your bronchial tubes, into your bloodstream and straight to your dome

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