The tag points to the Fate/Grand Order community, where JTR is the common shorthand for Jack the Ripper, one of the game's Servants. Short voice and reaction clips from the fandom circulate widely on soundboards because they are instantly recognisable to players, even when they are detached from a specific scene. This tickling clip survives for the same reason: it is short, characterful and easy to reuse, so editors keep reaching for it whenever a light, teasing moment needs a quick audio cue.