It’s when a menstrating woman lays on her side with one leg in the air during sex. Her kneeing partner strattles her lower leg, her upper leg resting on his shoulder, and his thumb in her anus. For the more advanced man he will also rub her bloody clit.
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"