'Aba aba' (阿巴阿巴) is a long-running piece of Chinese internet slang that mimics the babbling of someone unable to form words, the vocal equivalent of a blank stare. It spread through Bilibili and Douyin reaction videos and comedy edits, where creators pair the chant with dumbfounded faces, glitchy game moments and absurd fails. Like a well-timed funny laugh, it signals that nobody on screen knows what is happening, which is exactly why it still shows up in TikTok memes and livestream soundboards today.