"Cuckservative" is a pejorative formed as a portmanteau of "cuck", an abbreviation of the word "cuckold", and the political designation "conservative". It has become a label used by white nationalists and the alt-right in the United States. The word "cuckservative" reached a high level of mainstream political conversation around mid-July 2015, where it gained media attention just a few weeks before the start of the first Republican primary debate for the 2016 United States presidential election.
Read article on Wikipedia