“Cuck,” as an abbreviation of the archaic word cuckold was popularized by racist misogynists who were against, take your pick, a black president, the possibility of a female president, or politically correct culture for no other critical reason beyond being afraid of these things stepping on their fascist toes.

Before that it was archaic in exactly the same way as words like “ejaculate” or “intercourse” are–only used to explicitly talk about the sex acts they were originally euphemisms for.

By definition cuck has all kinds of baggage to it. But all of that baggage is on the part of the idiot who would non-ironically use it. I can’t think of another slur that so exquisitely reveals the psychosexual insecurity of the kind of person who would wield it, while at the same time having absolutely no power of any kind over the word’s intended audience.