From Wiktionary, the free dictionary
Rhyming slang referencing English disc jockey Pete Tong, coined by Paul Oakenfold in late 1987.
Pete Tong
- (rhyming slang) Wrong.
2012, Echo Freer, Magenta Sings The Blues, page 88 [1]:I might have been totally Pete Tong about this type of gig being Magenta's cup of tea
2020, IMDb review of "A Christmas Exchange" [2]:Cor blimey guv'nor, where did they get those accents from? [...] Their accents are completely Pete Tong.
Usually, but not exclusively, in the expression go Pete Tong.