1. bad hair day - Noun
2. bad hair day - Phrase
(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.
It's hard to have a bad hair day when you're famous. Marion Jones
Black Friday is not another bad hair day in Wall Street. It's the term used by American retailers to describe the day after the Thanksgiving Holiday, seen as the semi-official start of Christmas shopping season. Evan Davis
I think what people like about my channel is that I am not perfect. I always point to my pimple, my bad hair day... people relate to that. They are watching somebody who is exactly like them and talking about things that they experience as well. Lilly Singh