The act of ones jaw vibrating, clenching or protruding. This happens whilst under the influence of various drugs such as MDMA, Ecstasy, Speed etc. The morning after gurning all evening is very painful, and this is how people ruin their teeth on drugs.

The person who is under the influence usually chews on gum to stop themselves clenching or to stop their constant chomping on their bare teeth.

Too much gurning can lock-up your jaw in which it cannot move at all.
"I was on a major gurn out last night, mate."

"I've fucked my teeth from gurning"
by Crumpits March 30, 2009
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Gurn; or the act of gurning is to pull the lower teeth infront of the upper teeth.

some people are constantly, permanently gurning, or gurned, such as Robbie Marshall.
by gurnmagic ;) August 6, 2009
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A movment of the face and/or jaw whilst under the influence of ecstasy.

Many examples of this can be seen in nightclubs across the uk, a very rare case and example is someone who goes by the name of "brian" or "Gurn-tits" usually found in a night club called the krazyhouse. gurning on a an object to prevent his jaw from locking eg a shoulder of pork.
check out his gurn

does it look good when i gurn?

woah is he gurning on a leg of lamb?
by The gurn hunter July 28, 2008
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(verb). When a person suddenly begins to have strong cravings for or becomes incredibly desirous of something; like a particular food, person, drug, drink, sex-capade, etc. Unfortunately, due to circumstances, finances or other obstacles, these unlucky souls are usually are left unsatisfied, and are therefore left to "gurn." This craving is akin to what the French call, “La douleur exquise”- the exquisite pain of wanting someone (or something) that you know you can never have.
“It’s been three weeks since I have seen Greta, dude, and I am like, totally gurning for her!”

Or:
“So, I hate to admit it but, like, it’s always when I’m out of my stash that I gurn for it the most!”

Or:
"Paul loves the pain of it. He loves to deprives himself as long as he can stand to gurn and then he goes out on his jags."
by Flibberdigibbit April 30, 2013
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bud, green, weed, mary jane

born in cambridge, ontario, canada
smoke some gurn
by gurn lover January 18, 2012
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I went to the abando the other day and put up a gurn
by Fogarty Avenue July 5, 2017
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