Definition of What's up? in the Idioms Dictionary. What's up? phrase. What does What's up? expression mean? Definitions by the largest Idiom Dictionary. “What’s up?” is a common phrase used to greet someone and ask how they are doing. However, there are many other ways to say this in English, both formally and informally. "What's up?" is one of the most common English greetings, so it's a good idea to know how to respond when you hear it! WhatsApp from Meta is a free messaging and calling app used by over 2 billion people across 180+ countries. It's super simple, reliable and private, making it perfect for staying in touch with your friends and family worldwide. WhatsApp works across mobile, tablet, and desktop even on slow connections, with no subscription fees".
