WYS typically stands for “What You Sayin’?” or, less commonly, “What You Saying?” It’s a casual, texting-style greeting or prompt asking what someone is doing or what they’re up to, and it can also be used to ask for a quick update or opinion depending on context. In some circles, it may be interpreted as “What You Said” or “What’s Your Status?”, but the dominant modern usage is the greeting/intent to catch up or check plans.