A g-rated alternative for shitty pity or tough tits when in polite company or around children. A snappy substitute for the phrases 'too bad for you' and 'what a pity that x happened'. Can also be used as an insult when employed as sarcasm or feigning concern for another's well-being.
The term originated in 2007 during a game of pool in someone's basement where young adults were swearing excessively at each other's shitty shots (ie 'you stupid fucktard, how the hell did you miss that?' and 'haha douchebag! that shot sucked ass!'). One of their mothers happened to walk in and declared 'Shooty Pooty' in response to yet another bad shot.
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.