Source : Webster's Revised Unabridged Dictionary (1913)

Slyboots \Sly"boots`\, n.
   A humerous appellation for a sly, cunning, or waggish person.

         Slyboots was cursedly cunning to hide 'em. --Goldsmith.

Source : WordNet®

slyboots
     n : a shifty deceptive person [syn: {dodger}, {fox}]