Dopper noun2 •(South-Africa) A member of the Reformed Churches in South Africa, a Calvinistic denomination.His Dopper community of the northeastern districts of the Cape Colony was considered more pious and socially conservative than any other community in the colony. — 2003 •(offensive) An Anabaptist or Baptist.This is a Dopper, a she Anabaptist — 1625 formsDoppers