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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A Person from Guernsey in the Channel Islands, UK. Also commonly called a Donkey.
"Ah yeah he is an old Guern" is often used to describe an elderly local person who has lived on Guernsey for all or most of their life and who was born there.
by The one and only Guern February 5, 2010
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Nickname for some one who comes from Guernsey, an island in the English Channel off the coast of Normandy. Only used when the person is away from Guernsey, it is liked by those who dont have to return and loathed by those who'd rather be anywhere else but must return home to Guernsey .
You:"Hey Guerns, I cant believe you are gonna do all that crap just to get a visa. Fark that."
Your mate From Guernsey:"yeh well if you came from Guernsey, you'd do it too."
by sydxxx November 10, 2017
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