Que isso is a common Brazilian Portuguese expression used when someone is surprised, confused, or amused by what they just saw or heard. Online, short clips built around the phrase circulate as reaction sounds in videos, streams, and messaging groups, often paired with laughter written as hu3hu3 in Brazilian internet slang. The que icu spelling reflects how the phrase sounds when spoken quickly and laughed through. Its brevity and clear emotional shift have kept it in use as a reusable reaction for unexpected moments across social platforms and edited clips.