to write something quickly without caring about how it looks
I scribbled a rough diagram of our plan and gave it to him.
He tended to scribble notes in the margins of his textbooks.
The child excitedly scribbled with colorful crayons on the paper.
Unable to find a notepad, she had to scribble her ideas on a napkin.
The artist's sketchbook was filled with quick scribbles and doodles.