The line comes from Rubbadubbers, a BBC children's series that aired on CBeebies in the early 2000s, where bath toys imagine adventures from the bathtub. Finbar is the gang's toy shark, a brash and boastful character with a habit of passing blunt judgement. The clip reached soundboards through fan uploads tagged with the show's name, and it survives because childhood nostalgia makes it quotable: grown-up viewers who watched the series as children now drop Finbar's disgusted verdict over memes, fails and ugly reveals, giving an old cartoon insult a second life as a reaction sound.
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Finbar the shark from BBC's Rubbadubbers says 'that's disgusting' about Mr Kitty, and fans use it as a disgusted reaction sound for ugly or gross moments.
The clip captures Finbar, the brash toy shark from the BBC children's series Rubbadubbers, delivering a blunt verdict on Mr Kitty: that's disgusting. His voice is gruff, unimpressed and slightly superior, the tone of a character who has seen something ugly and refuses to pretend otherwise. It lasts barely a second, which makes it feel like a snap judgement rather than a real complaint. For viewers it lands as an exaggerated, cartoonish rejection, funnier than it is cruel, turning any ugly, tacky or gross thing on screen into a punchline with one confident line.