There is no single verified source for this exact clip, which is typical of short reaction sounds that circulate freely on soundboards and social video. It is best understood as a meme-style animal laugh: a human-sounding chuckle given a feline twist, so it works as a stand-in for a person laughing at someone else. Creators reuse it because it is short, instantly recognisable as mocking laughter, and easy to drop into edits without needing context. Its popularity comes from that flexibility, rather than from one famous video or character.