The act of pressing your and another person's anus together and defecating into the other person's anus, or the other person defecating into your anus.
Ray William Johnson: Last night I heard Sheila and MacDonald were Shit-Swapping!
Bart: What the hell is Shit-Swapping?
Ray William Johnson: MacDonald was letting Sheila take a fat dukey in his asshole!
Someone who acts just to keep up with a stereotype, and later instead of recognizing it, (Yes they're in denial) they tend to call others who aren't even close to a poser a 'Poser'. Pretty much, someone who believes they qualify for that certain label, but can't pull it off.
"Man, I'm Scene!" "Um, no, coon tail clip-ons and a BMTH shirt is not Scene, shut the fuck up, you Poser."
Anna's are bitchy people and care too much about themselves. They also care about others appearances. They get other people in trouble and they get away with it. When they are jealous of someone, it comes out as a bully situation. They think they are super popular but no one actually knows her. She always thinks she's better than everyone else and isn't considerate.