the head of a pin.
something very small or insignificant.
Slang. a stupid person; nitwit.

1655–65; pin + head Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pinhead (ˈpɪnˌhɛd)
1.  the head of a pin
2.  something very small
3.  informal a stupid or contemptible person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Bacteria may be microscopic-three million can fit onto a pinhead-but they are not invisible.
These are pinhead-sized red spots from which tiny blood vessels radiate.
But this seems to me to angelic pinhead density arguments about whether it's a
  payment to do something or not to do something.
But instead of addressing these issues, the article argues about the best way
  to count angels on a pinhead.
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