Definitions by J. Walt
pretard
An idiot who has not progressed to full "retardation". A person who acts stupid but has the capacity to be normal and sane. Almost on the verge of being incapable of running your own life.
preen
Shortened name for a pre-teen who is especially annoying or pre-teenish. Or can mean any pre-teen in general.
Middle schoolers are generally all preens.
post-tard
Someone who has gone from pretard to full retard and come full circle to being 'normal' again. A person who used to be incapable of normal life functions, but now is considered stable. Few people actually make the progression to post-tard. Post-tards are few and far between, but they exist.