dirty bike chain Share definition Flag When a Girl has a STD such as syphilis or any other nasty STD. Also when a man catches a STD from a girl. Stay away from that girl, she got that dirty bike chain.That girl gave me a dirty bike chain. dirty bike chain by Jay Riv May 17, 2023 0 0 Get merch Get the dirty bike chain mug. Buy Now — $32.95 See more merch