The words that sparked a heated exchange between Wallabies player Lukhan Tui and an angry fan at the Gold Coast's Cbus Stadium have been revealed.
Tui retaliated when the fan's taunts upset his nearby family members, after Australia's 23-19 loss to Argentina.
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The words were overheard during a live Fox Sports broadcast and minutes later, the tension boiled over, resulting in the fan being ejected from the stadium.
"You need to play with more heart," is the phrase that reportedly prompted Tui to respond.
"You're all f***ing useless. F***ing disgraceful.
"Why don't you play with some heart? You should all be f***ing ashamed."
Fairfax reported that the tirade continued for several minutes.
Crusaders and Wallabies forward Pete Samu was also involved, forced to step in and separate the two, as they grappled near the tunnel.
It capped off an already emotional week for Tui's family - his stepfather died suddenly on Wednesday and the Wallabies were wearing black armbands in his honour.
The flanker later told the team in the dressing room that he needed to take time away from rugby and would cut his 2018 season short.
"So I hope the fan's happy," Cheika said. "That's a pretty heavy thing to happen, he's just said it in the dressing room to the players now... he's not going to be playing anymore because of that incident.
"Obviously, that family's had a very big week and I don't think that's appropriate that that happened."
Newshub.