It's about when stuff like nukular bombs or yellow cake get spread around by evil doers.
"Yeah, I've thought about nukular perif-perifu... waitasec... nukular perifulation... whatever. It's hard. But I know it's a bad thing. It's a really bad thing, and it's just not good for the American people. And I'm gonna make damned sure Iraq stops doin' it, before it comes over here in the form of a big hairy mushroom cloud." --George W. Bush