A person who has accepted and become complacent to the deprivation of that person's role or identity.
The term is a shortened take of “cuckold” which is defined as “A
husband of an adulterous
wife.” The implicit message there, then, is that anyone called a “cuck” is someone perceived as emasculated.
A cuckquean, is the
gender-opposite of a cuckold, is a woman with an adulterous husband.