Green’s Dictionary of Slang

merry widow n.1

[Fr. veuve, widow + pun on The Merry Widow (1906), light opera by Franz Lehár]

Veuve Cliquot champagne.

[NZ]B. Crump Odd Spot of Bother 125: He swung a panicky leg out of the bed and knocked over a nearly full bottle of Merry Widow.