A way of telling someone to be quiet, or shut up. Or it can be used a way to interrupt.
*Girl Talking Shit*
Girl 1 - OMG. She's such a slut, like I would kick her ass.
Girl 2 - I'm going to have to red light you real quick
. Stop talking shit.
*Two males in fight*
Guy - Is it a scrap? Like what's good? Nize it.
Guy 2 - Nize it? RED LIGHT, RED LIGHT. Come at me then.