Originally Posted by
alexw
It comes from the white power and white supremacist movements. A "cuck" is a black man who has sex with a white woman while her husband watches. So the racists have turned that into a form of attack. For example a cuckservative is a conservative politician who watches as conservatives are ****ed over by a black president. Note I don't believe that is true in the slightest, but it is what goes on in their twisted little minds, and which Trump's campaign with its hate speech has in their minds legitimized.
So I have to wonder what sort of places the posters using this term, including johnyderp, have been visiting.