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He was so dumb he broke into a church and stole ten thousand dollars.... in pledges.
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He was so dumb he couldn't count his dick twice and get the same number.
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If dumbass were a commodity, he would have the market cornered.
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He was so dumb, his family tree was a shrub.
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He was so dumb he thought a foul ball is what the players scratch when they're sitting in the dugout.
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He was so dumb that he scotch-taped chickens to his body before going outside, because he'd heard that you stay warmer if you're dressed in layers.
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I don't want to say that he's a "dim bulb," but you know how Thomas Edison had to make hundreds of failed bulbs before he made one that worked? He is NOT the one that worked.