A fool, a simpleton, a mindless person.
"The shelter told us their new puppy is a doodle, specifically a golden retriever and poodle mix."
Any crossbreed of a poodle with a different breed of dog.
make a doodle; draw aimlessly
"She spent the entire meeting staring blankly at her notebook and doodling circles in the margins instead of taking notes."
To draw or scribble aimlessly.
"She spent the entire bus ride doodling on a napkin while waiting for her stop."