Place it at the start of a chat-reaction edit, right after the WhatsApp Message Sound, so the message lands first and it follows. Follow it with the Kiko Laugh for a one-two reaction, and keep the Plankton Ooooh for a later beat.
关于此声音
This is a half-second vocal clip of Lucas holding out a loud, drawn-out paaooo. The stretched sound lands as sudden and silly, like a burst of playful noise dropped into a quiet chat. It comes from a WhatsApp audio of Lucas making the sound himself.