The story
* hat + stand * (crazy, insane): From the "Roger Irrelevant" strip in the Viz comic, where this was one of Roger's absurd non sequiturs.
Etymology from Wiktionary, CC BY-SA 4.0.
hatstand
Today it means: A device used to store hats upon, consisting of a vertical pole with a sturdy base to prevent toppling, and an array of pegs to hold the hats. Full definition →