To be oblivious to the fact that the object being oggled or checked out is "fat as hell". A "chubby chaser". Or to think that fat chicks are good looking.
Bob is cellublivious- thought Dale as Bob pointed to a beached whale and said "That fat chick is hot!"
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?"