Something that's only wrong when it's not hot.

The term "wincest" consists of both win and incest.
It's basically an act of hot sex between family members, which makes it WINcest.

Commonly used in /h/ within 4chan.

Brotherly love of a sexual nature between Dean & Sam Winchester of the tv show Supernatural.

Derived from "win" and "incest".
As opposed to more common forms of incest where abuse is common, wincest must include both sibling and romantic love as well as mutually consensual sex.

As a result, wincest is almost exclusively between brother and sister, and not between parents and children. A related term, twincest, requires that the siblings be born as twins.

1. The romantic love between the brothers Sam and Dean Winchester from the show Supernatural, was previously a blanket term for any incestuous relationship in the Winchester family.

2. Combining the words "Win" and "Incest", a popular term in the anime/manga fandom for any sort of incest.

3. Sometimes just pertains to twincest, but lobbing off the t.

really, really good incest.

Incest (A.K.A. Wincest) is a perfectly normal, acceptable and natural act in which two people who are thoroughly related have sexual intercourse. This usually results in children who are very ugly and/or stupid, and in turn, fail at life. Such traits only appear on the first generation and if you have a whole bunch of incest babies then the ones with the defects will die off and it will weed out bad recessive genes and it results in genetically healthier offspring. But this only works if you have a lot, so if you do incest, have as many inborn babies as you can. Incest is one of the key tenets of /b/sexuality (i.e. one of the few things that can make a jaded /b/tard horny after being exposed to so much abstract pr0n), along with rape, pedophilia and gore.