Wiktionary
n. 1 (context Ireland historical English) Someone who, during the Irish famine, supplied food such as soup to Catholics who converted to Protestantism. 2 (context Ireland historical English) A (former) Catholic who converted to Protestantism in order to gain such food.
Usage examples of "souper".
Carmen, socially triumphant, would have been much more in her element at a petit souper of a not too fastidious four.
Hate and resentment thick as a pea souper, and only the ancient gods know what curses are lurking in those wrappings along with the dust and the amulets.
She often boasted that there were no soupers amongst the Mullinses, and John, who came of a long line of desperate soupers, kept mum.
Mesdames Cochois, Astrea, and Petrea, also the Signora Barbarina, to our petit souper.