wally grout /ˌwɒli ˈɡraʊt 
/ ▸ noun Australian English informal a person's turn to buy a round of drinks: grab some change and get a couple of pots of beer, it's your wally grout.
– ORIGIN 1980s: rhyming slang for ‘shout’, from Wally Grout (1927–68), an Australian wicketkeeper.
EnglishOxford Dictionary of English
