girl-a: "my boyfriend is third wheeling me with my bestie when we hang out and he is texting her more than me.. but i don't think he lost interest in me."
girl-b: "girl stop pink flagging him drop him right now"
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.