The word lul is widely used online as shorthand for laughing out loud, especially in gaming and streaming chat, where a short laugh can say more than a full comment. As a sound, it fits that same habit: a brief, instantly readable reaction that creators reuse across reaction videos, stream highlights and meme edits without needing any explanation. Because it is so short and generic, it travels easily between platforms and formats, and it remains useful whenever a clip needs a light, human laugh rather than a longer joke or a dramatic sting.