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A term, derived from Olde English, used to describe something that you should never see, or something that you have seen and wish you hadn't.

The origin of the term dates back to the mid-seventeenth century, where candlemakers in England would often check the temperature of molten wax using their tallywhacker.
Oh my God - some of the pictures on his mobile phone are definitely Chandler's Knob material!
by Ivor Scenit August 10, 2006
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