madame bishop, n. — Green’s Dictionary of Slang

madame bishop n.

[? SE bishop, mulled and spiced port. The popular ety. based on a link to the proper name of an Aus. hotel-keeper is prob. specious]

(Aus.) a mixed drink consisting of port, sugar and nutmeg.

1941		Baker Popular Dict. Aus. Sl. 45: MADAME BISHOP: A drink of port, sugar and nutmeg. Obs.
1972		B. Wannan Folklore of the Aus. Pub.