The Collaborative International Dictionary of English v.0.48:

Fico \Fi"co\, n.; pl. Ficoes. [It., a fig, fr. L.ficus. See
   Fig.]
   A fig; an insignificant trifle, no more than the snap of
   one's thumb; a sign of contempt made by the fingers,
   expressing. A fig for you.
   [1913 Webster]

         Steal! foh, a fico for the phrase.       --Shak.
   [1913 Webster]