People who have extra chromosomes and are best friends. "Chromie" referring to chromosome and "homie"s referring to " people who are good friends and would die for each other".
People who have extra chromosomes and are friends are considered extra chromie homies. Yesterday, John and I went into the extra chromie homie room by accident.
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?"