The story
Said to have been coined by British trichologist Philip Kingsley (1930–2016).
First known use, by meaning
- from 20th c. A day when one's hair seems unmanageable.
Etymology from Wiktionary, CC BY-SA 4.0.
bad hair day
Today it means: A day when one's hair seems unmanageable. Full definition →
First used 20th c.