When someone (preferably a woman) squats over your face and shits in your mouth. You then chew it until it is mushy or just generally chewed up and then regurgitate it back into their asshole.
You didnt create a big enough brown rocket for our three coursemeal
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?"