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The seemingly permanent smile that someone has after spending time with someone that they are very fond of, or doing something that they enjoy.
Kathi leaves work everyday with a Perma-grin. She must really love her job!

Look at the Prema-Grin that Christina is wearing this morning! I wonder who she was with last night?

by AnthonyOhio August 02, 2007
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A long lasting smile usually caused by the frivolous feel after a great session of sex. A great partner is required to achieve this higher plane of sexual satisfaction. Accompanies lightheadedness, temporary speech impendiment, being off balance, carelessness, blurred vision, and general sexual "outbursts"
He walked into the room with her, after five hours they both walked out stumbling with empty eyes and permagrins plastered to their faces.
by -Synthetik- September 19, 2006
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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
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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
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1) a blissfully wide post-coital grin indicative of particularly satisfying sex. usually indicates a strong sense of emotional closeness with the partner responsible for said sex. permagrin derrived from sex can often last for an entire day. this phenomenon is primarily experienced by females, but under certain circumstances can be found in males for the same reason.

2) a blank, complacent smile experienced after smoking an especially copious ammount of marijuana. permagrin will often fade once the initial high tapers off a bit, and the smoker regains cognitive abilities.

3) the blank, starry eyed grin which acompanies the ingestion of psychedelics. this type of permagrin typically occurs while observing something particularly prone to producing hallucinations, such as a moving light or toy.
1)Kim: "Wow... you've got permagrin. Have a good night?"
Jane: "Yep. Ten back to back orgasms. I love Reggie..."

2) Mike: "Heh... looks like those brownies are kicking in. Kev's totally got permagrin..."

3) Rich: "Is Raul tripping? He's been staring at that mirror for fifteen minutes with this permagrin on his face the entire time."
by sp00ki November 06, 2006
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A long-lasting, most likely goofy looking smile that does not go away for an extended period of time. This most likely happens when surrounded by awesome company, and great music in the middle of the ocean or on a tropical island.

The outward expression of absolute bliss.
Julie had permagrin the entire time she was rocking on the 311 Cruise ship!

Just the thought of the 311 cruise gives Julie permagrin!
by StoneyBaby November 14, 2012
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