Baptised Butthole
When you go to use the toilet in the middle of the night and your man leaves the toilet seat up, you sit down and fall into the toilet thus baptising your butthole with toilet water.
Last night I got a "Baptised Butthole" when I woke up at 3am to pee and of course the husband left the toilet seat up, I was so sleepy I didn't double check before I sat down and my ass fell in the toilet.