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3. couldn't pour water out of a boot

couldn't pour water out of a boot

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couldn't pour water out of a boot (if there was instructions on the heel)

Rur. stupid. I won't say Jim is dumb, but he couldn't pour water out of a boot. Jane couldn't pour water out of a boot if there was instructions on the heel—and she's the smartest one in her family!

See also: boot, of, out, pour, water