Toilettiquette...When visiting the restroom out on a date, or at a dinner party, you take a lightning fast crap to fool your date or fellow diners into thinking you only needed a piss by being in the can for such a short time.
a very hurried poop taken so as not to keep guests waiting
I really needed to take a shit but my date had arrived, so I told her I was just 'nipping to the bathroom to freshen up' and took a quick 'shit in a piss time', so as not to keep her waiting
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?"