It is a form of 360 ooga booga used to expression the pronunciation of Jeb.
Yo guess what I just landed a 360 ooga booga on Yens
No it’s Yens 360 ooga booga gotcha boom come here boy ooga booga rooga Fortnite bad that’s how you spell jeb
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"