thick

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He looked as thick as two short planks when asked to go forward but, when the penny finally did drop, he shot to the front inside the last to score by three and a quarter lengths from Lord Ofthe Shadows.
I'M still trying to work out whether I should be Ooohing and Aaahing over the reprieve of a calf that has become the Nation's Sacred Cow, or bloody insulted that this Government is treating the electorate like we're all as thick as two short planks.
IF ever we needed proof that - with a few notable exceptions - boxers are as thick as two short planks, here it is.