an expression defining how stupid someone is; chiefly British.
i.e.: the thickness of two planks of wood stacked one atop the other.
sometimes shortened to "two short planks"
"Whoah, you're thick as two short planks!"
someone who thinks they're quite intelligent
usually used in a mocking fashion, although it can also be meant literally
Susie: "I found a new way to spread butter on corn-on-the-cob with a basting brush!"
Susie's mum: "Well, aren't we the clever-clogs?"
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