The phrase comes from everyday Brazilian Portuguese, where muito engraçado is a common way to say something is very funny, but online it is mostly used ironically. The short clip spread through meme edits, reaction videos and messaging apps as a quick soundboard staple for calling out weak humor. Because it needs no context and the meaning is clear even to non Portuguese speakers from the tone alone, creators keep reusing it for fails, cringe moments and jokes that miss, similar in spirit to other dry reaction sounds.