Originates from the english phrase “no kizzy” meaning no lie or no cap. A person may use this phrase in a jokingly way when they want to tell someone else they are NOT lying.
Ex.
Friend 1- That party was turnt asf last night bro!
Friend 2- No Kizzaroo gang!!
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?"