Noun. A widely used term for behavior that redefines thunder-cuntery, specifically in the steampunk genre. Rumbletaint is literally an infectious disease, a horrible VD, a composite of the Clap, Crabs and Lead-Based-Paint-Poisoning from polishing the undersides of poseurs' zeppelins … with your mouth.
Oh dear Christ! I hung out with some uptight steampunks and caught me the rumble-taint! My junk is colors I don't have words for!!!!
That she-bitch gives me the shivers, I smell a bad case of the rumble-taint!