be a (real) piece of work

To be an exceptionally difficult, malicious, unpleasant, or objectionable person. Boy, our new boss is a real piece of work. Remind me to stay out of her way! A: "Amy's new boyfriend is a nightmare to be around! He's so bossy and argumentative." B: "Yeah, he's a piece of work, all right. No idea what she sees in him." Please tell me Mr. Stewart won't be at the benefit tonight—that guy's a real piece of work.