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1.
USed to describe a minor error made when writing on paper. A combination of 'Write' and 'Typo'.
I lost a mark on the test because of a stupid writo.
by The Dragon Swordsman October 14, 2004
 
2.
mis-write: a mistake in handwritten matter resulting from mechanical failures. (Similar to Typo)

A handwriting error

Short for writographical error
I cannot believe the prospective coop sent us a thank you card with a writo in it.
by AndyND November 18, 2010