Kadookaduke
Someone who makes mistakes like it's their full-time job and they get a bonus for being extra annoying.
My brother is a Kadookaduke. He forgot his own birthday and brought the wrong cake to my party.
My teacher is a Kadookaduke. She wrote the wrong answer on the board and nobody noticed until lunch.
My neighbor is a Kadookaduke. He put his trash can in my driveway and called it a prank.