sybau Share definition Flag Sybau – An acronym for Shut Yo B** **A** Up*, used to tell someone to be quiet in a blunt or humorous way. Example: Friend ~ Talking really loud. Me ~ Sybau, I'm trying to watch TV.By yousif Oulo sybau by Yousifoulo February 13, 2025 0 0 Get merch Get the sybau mug. Buy Now — $32.95 See more merch