Mary exhibits split menu personality syndrome as she places her drive-thru order, "Umm yes I'd like a Number 3 Value meal, super-sized with a small diet coke...oh yeah and add in an apple turnover"
Where someone acts arrogantly/annoyingly "pious 'n' preachy" ("I'm as honorable as a parson!") when publicly interacting with others, but is in reality a totally selfish/dishonest jerk in his private actions.
I somehow can never develop much respect for some highfalutin nose-in-the-air who claims to be a religious fanatic, but who also cannot appropriately handle even a simple moral-question situation --- talk about a split parsonality!
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.