When I read Caity Weaver's article on getting to the front at the Beyoncé concert to my officemate (because she was at the same show), I had to explain the term "slipping" to her, and how I know what it means. She has decided I've seen too many episodes of "Gangland". I told her there is no such thing as too many episodes of "Gangland".
For anyone who doesn't know, it's when you catch someone not paying attention. And if they are a rival gang member, you kill them.