To perform a ridiculous act, with a considerable chance of long term injury as a result. Can also be refered to as 'typical 'Oughts', when a stupid act is repeated, or is extremely predictable.
man 1: so what did you get up to at the weekend?
man 2: well, i set off a firework from my arse, but I over clenched, and gripped the rocket too tight. I badly burnt the cheeks of my arse. Luckily a pal tenderly applied coolent to my posterior. If I hadn't had that crate of super tennents it would have hurt so much i'd have had to stop drinking!