A 'retards mistake' is when someone surprisingly do something good, great or extraordinary even though everybody expected differently.

You expect a retard to do something retarded but if the retard do good. It must be a mistake...

The expression is from 'Life', a movie starring Martin Lawrence and Eddie Murphy.
The example given in 'Life', is when 'Can't get right' (Bokeem Woodbine) to everybody's surprise hit the ball during a baseball game. Everybody thought he was retarded, but he was just a mute...
"-George Bush just talked two minutes without any mispronunciation or nonsense coming from his lips.

-That must be a rare example of a retards mistake."
by Brune Hugorm August 03, 2010

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