Gronk

An Australian slang word used typically to insult some to the lowest or can be a substitute for the word idiot or dumb , like the phrase “scumbag” in America or “mug” in England. It can be also be used in a friendly way such when calling your friend an idiot if they tend to do silly or clumsy things

“who do you think you’re talking to”
“YOU YA GRONK GO F*** YOURSELF”

“what are you doing?”
“oh nah i slipped over aye”
“geez you’re a gronk🤣”