Top definition
A hat worn when you are having a bad hair day. This can be any type of hat, as long as it covers up your bad hair. Badhairhats are frequently worn the day after a party, due to the fact that a hangover is the major cause of terrible hair.
"Why is Tom wearing that awful hat?"
"Oh, that's just his badhairhat."

"Are you going to the festival tonight?"
"No I can't. I have a business meeting tomorrow and I don't want to show up with a badhairhat."
by Great Tuttar April 21, 2010
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