adj. Excessively rich, fattening, gluttonous, or unhealthy, often referring to food. Also, the feeling one has after consuming such food. Fattycatty can be used as both a positive and a negative.
Negative-- wife: "Let's get a pizza for dinner tonight"
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.