Crusty dusty dino can be used to describe a person who is not sharing and caring.
For example, Jamie McColgan was asked to get chocolate from downstairs by his loving sister as Jamie is very sneaky. Jamie said no! Therefore Jamie is a Crusty Dusty Dino.
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.