Petir comes from Indonesian and Malay, where it means thunder and lightning, and the extra letters in petirrrrrnih stretch it the way people type a rolling sound online, with nih adding a casual this is it feel. The clip spread through meme soundboards and short video edits in Indonesian speaking communities, then travelled further as a reusable thunder reaction. It stays popular because it works without translation, signalling drama, danger or a joke reveal in a few seconds, and because its exaggerated rumble is instantly recognisable even at low volume.
关于此声音
Petirrrrrnih is an Indonesian thunder sound effect with a long rolling rumble, used in memes and edits for dramatic reveals, jokes and sudden shocks.
Petirrrrrnih is a drawn out thunder rumble that stretches the word petir, the Indonesian word for lightning and thunder, into a rolling growl. It starts with a sharp crack and then keeps rumbling with that extended rrrr, making a normal storm sound feel exaggerated and a little ridiculous. The low vibration builds tension for a second before it becomes funny, which is why viewers instantly read it as a warning that something dramatic, embarrassing or over the top is about to happen in the clip.