An excuseguys use when they are in the shower for a long time because they are jerking off.
Wife: You took a long time in the bathroom to get ready this morning.
Husband: I was real tired and had trouble waking up. I fell asleep in the shower.
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.