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When you marry two half empty or more windex bottles to create a single more full more bottle of Windex
Megan WIncested the cleaning supplies so now we can give Dad a full bottle and his windows a thorough cleaning.

Jeanie can you Wincest those mostly empty bottles before that new hire gets here? I don't want him to think were cheap on supplies on his first day at the car wash.
Wincest by Torbert July 6, 2018
Having sex with your relatives until your heirs control the lands surrounding your greatest rival
I'm going to wincest my way into controlling the Spanish crown
Wincest by A totally real historian September 4, 2019
Something that's only wrong when it's not hot.
Ben 10: Alien Force could have such a wincest.

If you've seen it, you understand.
Wincest by Wenzel32 July 8, 2011
A romantic/sexual relationship between the Winchester brothers Sam and Dean.
Why does wincest exist?
Wincest by SPN4life May 22, 2018
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.
Incest + WIN = WINcest
Wincest by desu² September 11, 2011
Wincest is when you screw around with your PC. Combination of Windows, the OS, and incest, since with the amount of time you spend on your computer it's like a family member. You usually get some sort of STD from it, since the virus disabled the firewall.
It includes but is not limited to: adding RAM, updating drivers, installing new software/hardware, and actually humping the damn thing because you're so lonely.

It is also used to describe awesome incest, but that's a swiftly aging meme.
Wincest? This dude is seriously still calling anything that? Get a life dude.
OR
Oh my god see that guy with his laptop all opened up? Total wincest, get a room dude.
wincest by Scrambled gEsg November 12, 2010