The effect comes from The Battle Cats, the tower defense game by PONOS where cat units have a chance to deal critical damage for much higher damage than a normal attack. That mechanic made the hit instantly recognisable to players, and the short clip later spread beyond gameplay into soundboards, meme edits and fan videos. Because it is so brief and distinct, creators borrow it for other games and real life clips, using the familiar clang to signal that one hit mattered more than the rest.
About this sound
The critical hit sound effect from The Battle Cats, a sharp metallic impact used in edits to mark a powerful blow, lucky strike or game-style finishing move.
This is the short critical hit effect heard in The Battle Cats when a cat unit lands a boosted attack. It is a fast, bright metallic clang with a punchy thump underneath, lasting under two seconds and cutting off cleanly. The sharp attack makes it instantly readable as extra damage, even without the game on screen. Viewers feel the spike of impact and surprise, which is why editors use it as a punctuation mark for a sudden win, a perfect hit, or an unexpectedly strong move in a funny clip.