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1) A person who is exhibiting one or more of the following symptoms or habits: sleep deprivation, indifference to the world, lack of motor skills, no motivation to exist on earth any longer, poor decision making, and the occasional urge to kill yourself. Becoming knacked out is usually a result of intense mental or physical duress over long periods of time.
Those fucking pledges were knacked out.
by amateur philosopher January 22, 2011
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