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1.
A group of upper-middle class guys who hang together, are seriously image conscious, and think they are better than everyone else. They can each be directly related to one of the Disney princesses (Cinderella, Snow White, Ariel, Jasmin, Aurora, ...).
"That Princess Posse and their hair, *head shake* they use more mousse than the entire cheerleading squad."

"I guess it's not hard to look down your nose at people when you're in the Princess Posse."
by KTDigs November 26, 2011
 
2.
a prominent group of international young ladies for whom world domination is imminent! 9 supreme members with honorary membership growing at a healthy rate. Not a sorority, but a religion.
by Queen Me September 03, 2003