When a highly analytical person is compelled to create a grid in order to explain a concept.
"Mr. Prince-Nez got gridical when he insisted on pulling out the flip chart and marker to demonstrate the cross referential interplay of the data points along the X axis and Y axis of those people who like lunch before 12 noon and those after 12 noon.
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.