The story
Probably an alteration of earlier ream job (“anilingus”), later re-analysed as rim + job.
Etymology from Wiktionary, CC BY-SA 4.0.
rim job
Today it means: An act of anilingus, involving one person licking another's anus. Full definition →
Today it means: An act of anilingus, involving one person licking another's anus. Full definition →
Probably an alteration of earlier ream job (“anilingus”), later re-analysed as rim + job.
Etymology from Wiktionary, CC BY-SA 4.0.