"Sometimes… ummm… I f***ing lost… I lost my train of thought hearing that bullshit. F***ing Christ," Koepka says on camera.
"We're gonna enjoy that in the TV compound," Lewis says with a smile, to which Koepka replies: "I honestly wouldn't even care."
It's unclear what DeChambeau said or if it was merely his presence – or the fact that he was wearing steel spikes – that irked Koepka, but it shows how much the two don't really like each other.
The duo's petty feud dates back to January last year, when DeChambeau took a shot at Koepka's physique during a Twitch stream.
"I don't know if his genetics even make him look good, to be honest," DeChambeau said on the gaming streaming platform. "I mean, the Body Issue, he didn't have any abs, I can tell you that. I've got some abs."
The comments came after Koepka lost 20 pounds during the 2019 season ahead of featuring on ESPN's The Body Issue.
Koepka, who would go on to win his fourth major a few months later, would hit back at DeChambeau on Twitter.
"You were right @b_dechambeau I am 2 short of a 6 pack!," he wrote on Twitter alongside a photo of his four major trophies.
Koepka has since fired several light-hearted jabs at DeChambeau, while the big man known as "The Scientist" has stayed comparatively quiet.
DeChambeau does appear to be aware of the recent video, which has gone viral on social media, commenting on Instagram: "You know you can fix spike marks now."
Golf fans couldn't get enough of the video:
