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The muscle tension in the face that usually ends up with the jaw and tongue rolling and teeth grinding as a result of amphetamines.
Argh, I'm gurning! My jaw's gonna hurt in the morning!
by Nekromekanik May 22, 2005
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The uncontrollable mouth movement caused by certain drugs. without the aid of chewing gum can result in serious interior mouth damage.
mate these pills are banging, got some proper gurning going on
by rooney425 July 10, 2008
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symptoms: sometimes tight jaw syndrome and the abilty to waffle bollox.
by fluff ball September 02, 2003
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a phrase or word witch means an individual who is desperate to masturbate. usually can see these through facial emotions or erotic behaviour stereotypically found in the young male with second name Corner.

Symptoms include
Grunting LOAD grunting, thrusting hip movements,adjustments in groinal region
Sorry boys no more ps3 now your going to have to go i need to masturbate. Or the new term I'm Gurning all those meanings brought into one.
by babyrod March 14, 2011
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