After the talented contestant finished performing an incredible piano recital for judges Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams, he was stunned to see his former music teacher Mr Morgan in the audience.
The 32-year-old previously revealed the pair have shared a special bond ever since Mr Morgan attempted to shelter him after his head teacher Philip Lawrence got stabbed to death in 1995.
And when he saw him in the audience for the first time since 2004, he was completely shocked and appeared to mouth "f**k me".
Ant said afterwards: “Apologies for any bad language you may have seen in that last interview.”
Tokio Myers swore on Britain's Got Talent
Tokio Myers' former music teacher Mr Morgan was in the audience
Ant and Dec were forced to apologise after Tokio Myers appeared to swear
Many people watching at home didn't catch the inaudible moment and took to Twitter to discuss what he said as one person wrote: "Lol did Tokio swear?! oops! #bgt."
"For those wondering, I think Tokio mouthed some variation of ‘f**k me’ when he saw Mr Morgan? Was that it? #BGT," said another.
A third commented: "Apparently Tokio dropped an F bomb. I think we can forgive him, he's phenomenal #BGT."
Tokio, 32, certainly stole the show on the night with an impressive mashup of Rihanna’s Diamonds and Kanye West and Jay Z’s N****s in Paris.
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And Britain’s Got Talent viewers couldn’t help but gush over his mesmerising talent.
The pianist stormed through to the live final this weekend Britain's Got Talent: Most memorable moments Mon, May 1, 2017
Britain's Got Talent: The best and worst moments from the ITV talent show.
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“Tokio Myers blew me away again, absolutely mesmerising. TOKIO DESERVES TO WIN #tokiomyers #BGT,” praised one fan.
Another said: “Really enjoyed Tokio Myers. So unique, and such talent! Great to watch. #BGT.”
The hopeful stormed through to this weekend’s final after being voted by viewers along with nine-year-old comedian Ned Woodman.