Rimming a dog means giving a rimjob to a dog.

This is a very rude thing to do, especially to a dog that is not your own.
Zoltan: Why are you sharpening that machete?

Desmond: Franklin's been rimming a dog - my poor little Spotty. I'm going to cut him into jerky!
by scodder March 29, 2013
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When you’re giving someone doggy style and their dog gives you a surprise rim job.
I bent Marissa over and started to go to pound town… that’s when I got rim-dogged by Buddy! He’s so in the doghouse tonight!!
by BoSsDJ81 September 2, 2022
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