hole in one’s head n.1. [1940s+] (US) a lack of common sense.2. [1950s] nonsense, lies.SE in slang uses In phrases need like a hole in the head (v.) (also need like a third nut) [joc. use of SE but note Yid. ich darf es vi a loch in kop, ‘I need that like a hole in the head’] [1940s+] to not need at all.