The physical and mental state sometimes aquired by someone who consistently smokes, or used to smoke, a lot of weed. Typically characterized by the feeling and appearance of being stoned even when one is still technically sober.
See: Tommy Chong. The guy who works at your local smoke shop. Any stoner with a seemingly permanent smile and lazy eyes.
"Man, my dad hasn't smoked in years, but you can tell he's permastoned from his days on the commune".
Having the need to be slim. Seeing one self to be thin and at all times be obsessed to maintaining that body image.
Risking ones health in order to maintain certain body image is being permarexic.
Permarexia is the condition of a obsession with being thin.
She is obsessed with constant dieting she must be permarexic.