An incredibly ugly girl who is dating an attractive guy, suddenly the girl becomes unbearably arrogant and condescending towards her family, friends and work colleagues. This situation particularly arises when a guy is using the girl for his own sexual gratification.
Ah mate, recently my bird is so up herself . She's coming down with a serious case of mingeritus!
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?"