buttermybutthole

When a guy splooges/jizzes/spurts all over the butt cheeks of his sexual partner.

Only the most hardcore of people ever get their buttholes buttered.

Sophie: Hey, Phyllis how was your date earlier this week?
Phyllis: Hey, Sophie! Oooh, it was so much fun! Jared and I had a beautiful dinner by candlelight and then once we were done he butteredmybutthole so well! I had to use crutches to get around for a few days afterward...
Sophie: Okay Phyllis, nobody asked you to be so fuckin' raunchy...you could have just said it went well...
Phyllis: Sophie, you better shut your mouth hole or I'm gonna make you buttermybutthole too.
Sophie: Jeez Phyllis, don't threaten me with a good time...