The wolf whistle has long been used in film, cartoons and comedy as a shorthand for admiration, usually aimed at someone walking past or making a striking entrance. Online, the same short call has become a staple reaction sound, dropped into memes, TikTok edits and gaming clips whenever a character, outfit or play deserves an exaggerated compliment. Its popularity as a modern rizz sound effect shows why it still works: everyone recognises it instantly, and it adds humour without needing any words at all.