The state of being casually, sociably or lightly buzzed for inordinate amounts of time, e.g., a few days. Permafrosting usually involvs drinking upon waking up, and continuing to do so into the night (see: wake'n'drank.) Usually done on weekends or short vacations in foreign countries with a warm climate.
"Doesn't that gentleman look jovial?"
"Yes, I believe he's been permafrosting."
hydroponicmarijuana distributed among emo kids and sophomores at ike. n00bs think it is special and the best bud in the world, but is actually just normal dros, and given the name to make it sound special. kids who like permafrost normally smoke schwag or bc's and have never smoked real bud.