What is have some madeira my dear?

"Have some Madeira, my dear" is a line from a popular comedic song by Flanders and Swann, first released in 1963. Madeira is a fortified wine produced on the Portuguese island of Madeira. It is often served as an aperitif or dessert wine and is known for its rich, sweet flavor. The song is a humorous portrayal of two elderly women who drink copious amounts of Madeira and become increasingly tipsy throughout the evening. The line "have some Madeira, my dear" has become a popular catchphrase and is often used in reference to the humorous nature of the song.