Slob/slɑːb/ Definition 1 of 2Pro Tip 1/3Negative Connotation Used to negatively describe someone's habits, especially laziness or untidiness. He's such a slob, never cleans his room. Pro Tip 2/3Colloquial Usage Common in spoken English among friends, but too informal for professional settings. I can't go out tonight, I'm being a slob and staying in. Pro Tip 3/3Avoid In Insults While it can be used humorously among friends, it may be offensive if misused. Hey, no offense, but you're being a bit of a slob today.