To suddenly interrupt a cell phone convo by saying "COP HOLD"
If you are talking on a cell phone while driving, in an area where it is illegal, you have to quickly lower your phone out of sight if the police drive by.
Girl on phone: "So this creepy guy was, like, staring at my COP HOLD (pause)
BFF she's taking to: (understands the sudden interruption)
Girl on phone: "OK he's gone. So anyway..."