The clip is a user-uploaded voice recording credited to Sarah 'Vesener', running just over a second long, and beyond that credit its exact origin is undocumented. It belongs to the wave of short anime-style voice memes like NANI SORE and Japanese YOOOO that live on soundboards for instant reactions. The neko catgirl trope comes from anime and manga fandom, where characters punctuate speech with 'nya', the Japanese equivalent of 'meow'. Its charm is pure fandom shorthand, which is why editors keep reaching for it in cute compilations.