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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.
Bill Clinton, Whitney Houston, Charlie Sheen

Whitney Houston is the classic example of a post-tard because of her drug-related past and her re-entering into normal society.
by J. Walt February 11, 2007