a "permanent grin" which one can only achieve through being in a totally different dimension (usually through use of peyote, lsd, and is definitely popular with shrooms)
guy1: so herd everyone went trippin this weekend, how was it?
guy2: it was great, everyone was real chill, paul's dumbass had a stupid perma grin that he couldnt wipe off and he didnt say shit the whole time. Hes such a sleezebag.
by Mac Linton June 24, 2005
to be constantly grining.usually from the affects of acid, LSD.
Man he's tripping so bad he got permagrin
by turbo October 08, 2003
Permanent grin. Usually a result of great fortune arriving in someone's life; a brand new love, winning the lottery (or one of my personal fav's: watching someone illegally passing on the shoulder during rush hour and promptly getting NAILED by the cops.)

source: R.Lutz of Montana
Look at the perm-a-grin on Rob's face. He is totally twitterpated with Kristy. He smiles all the time; can't stop talking about her; he is always texting or calling her. That boy is whipped!
by Rob G. aka theTexasWolf February 22, 2007
It's the " permanent grin " you receive when you're stoned.
" Man, my cheeks are sore. I had a perma-grin for about an hour. "
by GOES OUT TO WILL GREGG! March 25, 2008
the 8+ hour long visage of transcendental amusement that accompanies psychedelic experiences, namely LSD and shroom trips.
"Dude, its kicking in. You've got the perma-grin!"
"You too man. Oh shit. Look at my hands...."
by twamp November 14, 2003
A state of real, complete, happiness usually only experieced in the mountains.
Just hike and biked to fourteeners and I am all permagrin.
by Sniggins May 08, 2003
An automatic and irremovable smile that appears on the face of people who are thoroughly intoxicated with some narcotic; usually marijuana, hashish, mushrooms, or lsd. Can be found in other cases such as on television morning news anchors, beauty pageant contestants, pop queens, and mental patients.
"Look at Greg! Dude has Perma-grin! That must be some good shit!"
by Tam Tam in the Bay November 18, 2005

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