A person who makes a display of farting loudly, or trying to fart as loud as possible, perhaps by lifting one leg and wincing as they do it(Usually a male practice, of those aged about 14 to 20.
Hey, Thunderpants, cut it out man, my mom's downstairs and she willthink I did it.
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?"