baboon kiss
When two butts touch like they're best friends. It's not cute. It's more like a butt-butt reunion with a side of drama.
My sister and I bumped butts at the park. It was like a butt-butt reunion with drama.
I bumped butts with my crush. He looked like he had a bad day at work.
My friend and I bumped butts during a movie. It was like a butt-butt reunion, but with popcorn.