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1.
When you get stoned on weed after a certain point your mouth will get really dry.
"Dude, pass the water, I've got drymouth"
by Jake January 22, 2005
 
2.
Noun. Drymouth describes any liquid that quenches the thirst of a group of stoners. The participants will often select a drymouth before they light up. The best drymouths are often considered to be Lucozade and Oasis Citrus Punch.
"Ra! Pass me the drymouth Jay"
"Don't be drinking all the drymouth"
by Mark_5000 December 25, 2007
 
3.
To get really thirsty after smoking weed.
"Where's the water, I got drymouth."
by bawm March 09, 2008