rimfax Share definition Flag To send a picture of one's photocopied butt using a fax machine. It was the sexting equivalent of the 90s for horny office workers. Carla was feeling bored, so she rimfaxed Jeff in accounting her xeroxed butt. rimfax by NoobLeeAsiaMay August 16, 2014 0 0 Get merch Get the rimfax mug. Buy Now — $32.95 See more merch