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The TikTok was uploaded 13 hours ago (11 Oct) by @doesthisfeelgood and she labelled it as 'the most chaotic show I've ever been to'.
However, fans have commented on the clip and have accused the 54-year-old of doing the salute to the audience.
One user wrote: "Uhhhh we all just going to brush past that part," whilst referring to the gesture.
"UM THE SALUTE???" another user added.
Someone else commented: "That salute looking real suspicious."
A person, who suggested she was at the concert, claimed: "Oh he did the salute more than once."
Despite the accusations, it appeared that the lead singer was drunk and shouted a few controversial statements at the crowd.
After it appeared there was some technical issues, Harwell said: "I'll f****** kill your whole family I swear to god."
He also, bizarrely, claimed: "If I could suck my own d*** I'd never leave the house."
The TikToker explained that the music was 'out of sync' and the event was absolute mayhem.
She said: "Ok I know the ethics of this aren't great but I did just see Smash Mouth perform live at a local beer and wine festival.
"When I say this is the most chaotic show I've ever seen in my entire life, I have no words."
In the text overlay of the TikTok, she claims that 'at no point was the sound not painful' with 'so much mic feedback' and 'unintelligible speech'.
Haley's clip has gone viral and racked up 325,500 views and 52,800 likes.
Many in the comments section were 'shook' with the performance, in general and for anyone who is a fan of Shrek, will remember Smash Mouth's 'All Star' as being one of those major songs from your childhood.
LADbible has contacted Smash Mouth's representatives for comment.
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