idiotcap
nounUK /ˈɪdiətkæp/
US /ˈɪdiətkæp/
A silly cap that someone wears on their head.
He put on a bright idiotcap and made everyone laugh.
OTHER MEANINGS
2. A cap worn as a joke to show someone is being silly.
They gave him an idiotcap after he told a goofy joke.
3. A playful name for a hat with bells or funny points.
The clown's idiotcap jingled as he walked.
4. A small mushroom with a rounded, funny-looking top.
We found an idiotcap growing near the old tree stump.