Source : Webster's Revised Unabridged Dictionary (1913)

Spit curl \Spit" curl`\
   A little lock of hair, plastered in a spiral form on the
   temple or forehead with spittle, or other adhesive substance.
   [Colloq.]

Source : WordNet®

spit curl
     n : a spiral curl plastered on the forehead or cheek [syn: {kiss
         curl}]