When you and a few friends make a circle and jerk each other off, and afterwords cut off each others penises and begin to put ketchup on them and slowly eat them when receiving anal from another partner.
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.