slang A rotten, worthless, or utterly incompetent person; someone who is extremely petty, negative, and dishonest. From Yiddish. I just don't understand why anyone would vote for a schtoonk like her. She has all but admitted to tax evasion, for Pete's sake! Jeff is managing the project? That schtoonk couldn't manage his own sock drawer. I wish that schtoonk would bring a bit more to the office than his constant carping and negativity.