baboon kiss
When you butt head with someone, and it feels like they just sat on your face. It's not a kiss. It's more like a butt-butt slap with no mercy.
I bumped butts with my crush. He looked like he sat on my face.
My friend and I bumped butts during a dance. It was like a butt-butt slap with no mercy.
I bumped butts with my mom. She looked like she was about to kill me.