The clip comes from a TK video about Pokemon GO, where the line 'Pokemon c'est pour les gamins' is performed as an imitation of a dismissive guy rather than a serious review. Pokemon GO revived the long-running joke that adult players were chasing a children's game, and short reaction sounds like this spread because the phrase is instantly understandable even to non-French speakers. It remains in use on soundboards as shorthand for mocking nostalgia, fandom enthusiasm, and any hobby an outsider calls childish.