1 definition by jwrs50

Top Definition
A thick layer of white substance that covers most of your tongue if you're a long-term marijuana user. Causes reduced effectiveness of tastebuds and poor oral hygiene.
"Your tongues's rottin' out from cottonmouth, when you're so dependent on weed you end up spendin' a G in the vending machine."

Been smoking for too long, really bad cottonmouth.
by jwrs50 October 24, 2011

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