mr. zetwick Share definition Flag A very useless teacher who does not teach well and confuses students. After confusing students, he yells at them. A bad teacher. Person 1: "Our teacher is terrible!" Person 2: "Yeah, he really is Mr. Zetwick." mr. zetwick by definitionsssssssssssssssss December 4, 2016 Get the mr. zetwick mug.