When you visit a city located on the Pacific Rim (Tokyo, Sydney, etc.) and get some sort of sexual action, such as a hand or blow job. This gives someone asking about your sexual activity just enough information to know if you got some but not enough to disturb them.
When two very large people orally pleasure one or the others anus in an aggressive way that is destructive to the environment around them due to their sheer size.
Dude 1: Did you hear that big Bill and Bertha totally fucked? I heard he gave her a rim job.
Dude 2: With their size, it was probably more like a pacific rim job!