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1.
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
 
2.
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