Definitions
1.NounA fool, a simpleton, a mindless person.
2.NounA small mindless sketch, etc.
3.NounThe penis.
4.VerbTo draw or scribble aimlessly."The bored student doodled a submarine in his notebook."
5.VerbTo engage in something non-seriously; fiddle.
6.VerbTo drone like a bagpipe.
7.NounAny crossbreed of a poodle with a different breed of dog.