Someone who gets wasted at a party and shits on the floor, the couch, and the wall. Then, the Shit Bandit leaves mysteriously, like a bandit, leaving his friends behind to clean up the mess. The "Party Pooper" is called a Shit Bandit because he steals the fun from the party, like a crafty, stinky, fecal-covered bandit.
When Tyler shit everywhere at the party, then mysteriously left, everyone knew that he was a real Shit Bandit.
Someone who ruins a party by getting totally wasted and shits on the floor, the couch, his friend's polo, the wall, and many other places. As well as shitting all over the place, a Party Pooper can sometimes also throw up underneath a dog bowl, piss on the kitchen floor, or on someone's shoes. The Party Pooper usually awakens the next morning covered in his own shit, vomit, and piss. The Party Pooper flees the party house in a state of confusion, leaving his disgruntled friends to clean up his disgusting mess.
A classic example of a Party Pooper is Tyler Price, who did everything that is described in the definition.