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1) An award or accolade given to someone for being bad at something.
2) An action performed so miserably, you deserve a medal for how bad it is.
After wearing galoshes every day to school, Ed recieved the "Worst Dressed" unchievement in his yearbook.

When Sara messed up her cupcake recipie, her oven exploded. Unchievement.
by SKYGONZ October 11, 2011
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