It is kinda that it sounds like, booty-to-booty, it's the same as ass-to-ass, butt-to-butt etc...
When two women with big butts, put their booties together, like massaging, slamming, bumping, pressing thier booties together in "booty-to-booty" positions.

Their is lots of positions: sitting on a another booty booty-to-booty, standing back to back booty-to-booty, both bending over and standing booty-to-booty, both down on their knees adn backin' their booties together booty-to-booty.
It's all about fantasy, having fun.

Some women love doing this together and having some booty-to-booty contact, it could also being competitive and then like comparing their booties, it's bein called a "booty battle".

Someone people turn to when they're sad who makes them feel better.