wally grout
/ˌwɒli ˈɡraʊt
/noun Australian 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...
- You must never forget your wally grout.
- Cheers, your wally grout.
- When it's your wally grout, don't horse an' cart around.
Origin
1980s: rhyming slang for ‘shout’, from Wally Grout (1927–68), an Australian wicketkeeper.