The exact original source of this audio is unclear, but it is widely shared online as a Brazilian Portuguese meme clip. People search for it using spellings like “cavalo de tres pernas” and “um cavalo de três pernas,” which helped it circulate across meme pages, reposts and short edits. Its staying power comes from how short and flexible it is: the phrase is strange on its own, so creators can drop it into many different contexts as a quick absurdist reaction, much like goofy ahh sounds in chaotic meme compilations.