a person who completely surrenders to his crew of friends, mimics the groups' personalities, and follows them from place to place. The group is the most significant object of the individual's life, overpowering longer known friends and girlfriends.
1. Man, I haven't heard from Miles in over a week, he keeps hanging out with his new crew, that fool is posse whipped!
having one's fortune bled dry by an entourage of false friends who feel entitled to what is "theirs"
(name of athlete or celebrity) was posse whipped into bankruptcy.