Now the pundit has been warned there can be no repeat of the four-letter gaffe at the Betfred World Championship.
The 63-year-old former player was watching the first-round clash between Scottish pair Stephen Maguire and Anthony McGill in Sheffield.
The contest was going out live on the BBC TV red button with Leicester’s Thorne sitting next to former world champion Peter Ebdon in the commentary box.
Willie Thorne dropped the F-bomb live on air Wold Snooker prize money rankings 2017 Thu, April 13, 2017
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And with world No15 McGill struggling badly, and trailing 6-2, Thorne said: “When you ‘go’ here Pete … it’s a f***ing nightmare.”
Graham Fry, managing director for programme-makers IMG Productions, said: “Willie Thorne deeply regrets what he said. He is well aware that it can’t happen again. “
All commentators have been warned that microphones are live all day.”
Two-time world champion Mark Williams was quick to highlight audio of the blunder on social media, saying: “Oh dear Willie.”