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Guerning is the grinding of the teeth while high on pills, ketamine or MDMA. When a person takes extasy its more than likely they will start to grind their teeth. Often the user will take chewing gum to prevent tooth damage, and an aching jaw.

A person who Guerns their teeth, are refered to as a Guernatron.
Person A: Whoah! Look at that dude!

Person B: Jees hes Guerning!

Person A: That will hurt in the morning =S
by ARGoode January 26, 2009
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