Urban Dictionary: Definitions by Ken Deacon

Butt posse

1. The group of people who hang outside building doors and stairways smoking every day at work.

"TM me if the boss comes back, i be hangin with the butt posse."

2. A bunch of guys who are banging the same chick.

"The STD clinic made her call everyone in her butt posse."

3. The same old group of friends who repeatedly save your ass.

"I'm giving everyone in my butt posse $5 gift cards for Christmas; think it's enuf?"