A bad hair day is also a day when everything is going bad. It has nothing to do with how one's hair really is, it's just that everything is going wrong. The term "bad hair day" derives from how psycho one feels because everything is going all wrong on a particular day!!

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.

A day in which, despite normal styling efforts, one's hair looks bad, wrong or strange.

a bad day in general (from the belief that the appearance of one's hair is connected to how well the day goes)

When despite your'e best efforts you still look like a Cunt
or just a shite hair-do ,see Michael Bolton

When you ejaculate in or under your partner's hair, while they're asleep. So that it dries and they find it the next day.

When you sperm in someones hair and then use it as hair gel.