36
The de facto title of a series of Coors commercials from the early 2000's.
My buddies and I are really into identical twins, so a few times a week we throw some Twincest on my TiVo, crack open a Coors, and fill up 4 jumbo breast-sized water balloons a piece to smoosh in our collective faces.
by The Booz June 28, 2011
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37
When two twins both female do anything sexual to either each other or to someone else with each other.
The twins both screamed at the word twincest.
by PainCorp July 11, 2004
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38
When twins get together in a odd and disturbingly immoral relationship to the out side world. A mix of incest and twins.
Laurie: damn you see those blonde twins over there, they are having a twincestual relationship
Josh: that is gross, and not to mention immorally disturbing.
Laurie: damn straight it is,andi thought the girl was hot.
Josh: obviously so did her brother.
Laurie: just like those gay scots the proclaimers.
Josh: lool
by Chizeej- on behalf of Lozz April 17, 2007
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39
When twins are in a romantic or sexual relationship with each other.
TWINcest is WINcest

The Hitachiin twins. Look it up.
via giphy
by The sexless knight June 27, 2017
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