bad hair day
- (literally) A day when one's hair seems unmanageable. [from 20th c.]
- (idiomatic, by extension) A day when things seem to be unmanageable or go wrong.
What's the matter with Fred? Oh, he's just having a bad hair day.
- ^ “Philip Kingsley, celebrity trichologist – obituary [print version: Philip Kingsley: Trichologist who treated Audrey Hepburn and Laurence Olivier and coined the term ‘bad hair day’, 17 September 2016, page 35]”, in The Daily Telegraph, 16 September 2016, archived from the original on 16 September 2016.