Sloppy and untidy. Often used to refer to people and their clothes but can refer to a wide variety of situations and things. Some things are worse than others; you wouldn't want a slovenly legal team or sushi chef.
Vincent Bal is a Belgian illustrator and filmmaker who does a wonderful series of illustrations involving long shadows of everday objects and doodles around them. He posts a variety of them on his Instagram, including these:
Go check out Bal's Instagram for more drawings and his Etsy shop for prints of your favorite doodles.
IllustrationDoodlesVincent BalShadowsNegative space