Source : Webster's Revised Unabridged Dictionary (1913)

Doodle \Doo"dle\, n. [Cf. {Dawdle}.]
   A trifler; a simple fellow.

Source : WordNet®

doodle
     n : an aimless drawing [syn: {scribble}, {scrabble}]
     v : make a doodle; draw aimlessly