Derived from Katamari the video game where the object is to roll up a giant ball of random objects, and Conkers Reloaded the video game where one objective is to collect poo balls by rolling them.
A Scatamari is a giant unstoppable cumulative snowball of scat, or shit that anything and everything gets stuck to.
eg.1: Life is like a Scatamari, the longer you roll along, the more scat you accumulate and it takes a large impact to knock some of that scat off.
eg.2: This project is turning into a Scatamari, the longer we work on it the more shit goes into it.
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.