Wiktionary
drinking song
n. a song which celebrates or accompanies drinking
WordNet
drinking song
n. a song celebrating the joys of drinking; sung at drinking parties
Wikipedia
Drinking Song
"Drinking Song" or "Drink, Drink, Drink" is an exuberant song composed by Sigmund Romberg with lyrics by Dorothy Donnelly. It is the most popular piece in the 1924 operetta, The Student Prince. It was a success for tenor Mario Lanza, who performed it in the 1954 movie, though the part was played on screen by another actor, due to a contract dispute.
Usage examples of "drinking song".
Farmers bellowed drinking songs in the taverns because singing drowned out the noise of backbones that creaked and snapped when honest working men at last unbent their spines from the labor of reaping and stacking, threshing and winnowing the grain.