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"What's up" is an informal greeting that is often used as a way to say "hello" or "how are you." It is a casual and informal way to initiate conversation, and it is often used among friends and peers. The phrase is versatile, and it can be used in different situations, such as when you meet someone new, when you haven't seen someone in a while or when you're trying to start a conversation with someone. It is a colloquial expression and it's commonly used in spoken language, but it can also be found in text messages, social media, and online chats. It is a way to signal that you are friendly and approachable, and it is often used in a more relaxed or casual setting. Some people might respond to "What's up" with a simple "not much" or "just hanging out" as a way to indicate that they are relaxed and open to conversation. Other people might use the phrase to ask about someone else's well-being or to express their own. It's a simple but effective phrase that helps people to connect and make small talk.
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