A derogatory metaphor used to insult someone's intelligence level and comprehension of common sense, comparing their IQ to that of a box of hair, which--all things equal--should have an IQ of zero.
That nuthugger would probably be smarter if her brain was replaced with a box of hair. Wait, probably not.
by Juice March 08, 2005
Used as an ultimate example of stupidity or uselessness in people, ideas, or objects.
Bob is as dumb as a box of hair.
My boss's newest scheme is about as dumb as a box of hair.
Most of Mr. Popeil's products are about as useful as a box of hair.
by The Hair Bears August 25, 2006

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