Merriam-Webster's Collegiate® Dictionary, 11th Edition
DOODLE
I. verb (doodled; doodling)
Etymology: perhaps from doodle to ridicule
Date: 1935
intransitive verb to make a doodle, dawdle , trifle , transitive verb to produce by doodling, doodler noun
II. noun
Date: 1937
an aimless or casual scribble, design, or sketch