Related Clues:

• Make squiggles
• It may result from a long phone conversation
• Scribble aimlessly
• Draw aimlessly
• Rough sketch
• Scribble
• Write or draw aimlessly
• Random drawing?
• Kill time, in a way
• Pass the time with a pencil
• Draw absentmindedly
• Draw idly
• Daydreamer's doing
• Bit of scribbling
• Drawing in a margin, maybe