Cojones is a well-known Spanish slang word for testicles, widely used figuratively to mean courage, nerve or guts. In online video culture, short clips of the word are shared as a reaction sound because the delivery alone carries attitude, even for viewers who do not know the literal translation. It appears in memes, gaming clips, pranks and edits where someone shows bravado, takes a risk or calls out cowardice. Its brevity makes it easy to drop into a cut, and its blunt humour keeps it popular as a quick punchline.