Short for cuckold. The Cuckoo bird lays it eggs in other birds nests. The birds feed the Cuckoo fledgling while the little Cuckoo pushes their own eggs or fledglings out of the nest. Thus the parents are Cucks.
In human terms, a Cuck is one who serves interests other than his own. Thus a White Man raising a child fathered by another man is a Cuck. About 10% of married men are just such cucks, made fools of by their wives. Always get your newborns tested.
In political terms, a Cuck in one who serves aliens and not his own people or nation. Thus people who support Israel before America are Cucks. Or people who support Blacks before their own race.
