The wolf whistle is a long-running comedic shorthand for admiration, made famous by cartoons and comedy films where a character reacts the moment someone attractive walks past. In online video, that same cue has been reused for thirst traps, glow-ups, fashion reveals and playful crush edits, often alongside the rizz sound effect in short-form videos. The slowed-down version leans into the joke by stretching the reaction, making the admiration feel deliberately over-the-top rather than realistic, which is why editors still reach for it for quick, instantly readable humour.