1) Going out with your squad to kill (or slay) the night or day.
2) Going online to chill and play video-games with your friends that involve killing.
3) Chilling to kill time.
1)
Person 1: Let's go out with the squad to chill and kill.
Person 2: Sounds fun lets kill the (night/day).
2)
Person 1: Hey wanna go online to chill and kill?
Person 2: Sure! Let's kill them!
3)
Person 1: Wanna chill and kill time?
Person 2: Yeah I'm bored lets just chill and kill time.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.