Cobain rainbow

(n.) a red streak running a wall, usually vertically, to the floor, accompanied by generous spatter, and sometimes puddles; the medium used is often some sort of body fluid, applied with the use of bodily contact and/or a firearm.

Man, I hate stupid people. Sometimes I wish they'd all go home and paint a Cobain rainbow on their wall. Hell, if they provide the medium, I'd be more than happy to provide the brush.