doo·dle (ddl)
v. doo·dled, doo·dling, doo·dles
v.intr.
1. To scribble aimlessly, especially when preoccupied.
2. To kill time.
v.tr.
To draw (figures) while preoccupied.
n.
A figure, design, or scribble drawn or written absent-mindedly.
[English dialectal, to fritter away time, perhaps from doodle, fool; see doodlebug.]