When you get cornered after meetings by old folks at work and you can't be rude and say that you have to go because their stories meaneverything to them. Text your co-worker "SMSB", he/she will come and rescue your soul.
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.