1.Having so much consecutive sex the vagina starts burning with further penetration
2. Having so much sex it leads to a urinary tract infection and burns when you pee
3. Having an STD in which the symptons include burning sensations in genital area
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.