offensive slang A man regarded as completely ineffectual or entirely subservient to a woman. The term also carries racist undertones due to its use to refer to a type of pornography depicting a white woman having sex with a black man while her husband watches. "Cuck" is a shortening of the word "cuckold"—a man whose wife has been unfaithful. Primarily heard in US. I'm sick of these cucks who keep voting for women.