☆ to scribble or draw aimlessly or nervously, esp. when the attention is elsewhere; make doodles
☆ Informal to play music in a casual, informal way
Origin:
Ger dudeln, to play (the bagpipe), hence to trifle, dawdle (< Pol dudlić < dudy, a bagpipe < Turk duduk, a flute); reinforced by echoic tootle & dawdle