The combination of the words "petty" and "etiquette" (also spelled pettyquette). This refers to the rules and etiquette of pettiness or behaving pettily or in a petty fashion.
Pettyquette, also spelled "pettiquette" is the combination of the words "petty" and "etiquette". It is the proper way to exhibit pettiness or petty behavior (the ways/manners of pettiness).
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.