Place it right after the claim it answers, then follow it with the Oh My God Wow sound for extra disbelief, or put the Damn sound before it to build up to the reaction.
このサウンドについて
Mmaa Nyɛ is a short spoken reaction clip lasting just over six seconds, built around a single expressive phrase delivered in a direct, conversational tone. It lands as funny and slightly exasperated, the kind of sound that makes a listener smile at a familiar overreaction before the moment passes.