The definition is somewhat open right now as I understand it, a bit twisted...in my opinion...but it's not good, that much I can assure you...very dark days are at hand.

"Very basically, the cuckservative is a white gentile conservative (or libertarian) who thinks he’s promoting his own interests but really isn’t. In fact, the cuckservative is an extreme universalist and seems often to suffer from ethnomasochism & pathological altruism. In short, a cuckservative is a white (non-Jewish) conservative who isn’t racially aware."