noncon UK /ˈnɒnˌkɒn/US /ˈnɑnˌkɑn/adjective 2noun 1 adjective2 •(slang) Of sexual relations, non-consensual.If I enjoy noncon scenes it's b/t people who are decidedly still enemies, not friends/lovers. — 2002 •Involving consensual non-consent.I liked the point you made about the ep showing both consensual and noncon BDSM. — 2002 noun1 •(slang) Erotica featuring non-consensual sexual situations such as rape, mind control, or somnophilia.