Wondering what SYBAU means in texting or on social media? SYBAU is a slang acronym that stands for “Shut Your Bitch Ass Up,” a rude and offensive expression used to tell someone to stop talking. Its tone can range from joking banter among friends to a direct insult, depending on the context. Explore the SYBAU meaning, common online uses, and examples to understand this trending internet slang.