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mental runt N. A person who lacks the social grace to servive in daily life skills. Adj. The last sibling born out of a minimum of 4 kids. mumbles, inappropriate grabby hands, dried drool in the corner of mouth, eating with hands, falls in tar, bewildering blinking to focus on shinny objects, drunk dialer, same question every 5 minutes that you do not know the answer to and have told the mental runt. Most people use the opportunity to run from a mental runt while they are in the bathroom.
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