Short for "nonconsensual" in fanfiction, regular fiction, or just in general referring to various kinds of relationship scenarios where one or both of the participants is forced into sex. Generally associated with rape fantasy and highly controversial.
On the whole, relationships in fanfiction are between two consenting individuals, but there is the occasional noncon.
by Zen November 29, 2004
An individual who consciously goes against what's popular; short for "nonconformist"
"She won't go to the movie theater anymore - she's too much of a noncon."
by Malik Debtran July 3, 2003
Consensual non-consensual. Typically used in BDSM scenarios, rape roleplay that is pre-discussed by two consenting individuals
Joe: Hey Betsy, wanna try con noncon?

Betsy: Yeah! Get on the bed bitch.

Joe: No!

Betsy: *Fucls Joe*
by thepersoninyourcloset July 1, 2015