a strange derivative word coming from both the geographic area, the Pacific Rim, and the sexual favor, the rimjob
. it is a sexual favor preformed on another person who is suffering from violent, nay, volcanic diarrhea where the tounge circles the exterior anal area. the reciever may be eeperiencing the diarrhea or not, that is the surprise element.
She should have told me that she had corn last night before i gave her the good ole pacific rimjob.