"Wby" is an abbreviation used in informal text messaging or online conversations. It stands for "What about you?" or "What 'bout you?" It is a shortened way of asking someone about their opinion, response, or situation after they have asked a question or shared some information about themselves.

For example, if someone asks you, "How was your day?", you could reply with "It was good, wby?" This means you are asking them the same question back, wanting to know how their day was.

As with many internet and text message abbreviations, "wby" is mostly used in casual and friendly conversations. In more formal settings or professional communication, it's better to use the full phrase "What about you?" for clarity.

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Reference:

“WBY” Meaning: What Does WBY Mean and Stand for? • 7ESL
If you’re reading this, you’re probably wondering what WBY means. Good news, you’ve come to the right place! You’ll be learning what it means, how to use it,
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What Does ‘WBY’ Mean? | Acronyms by Dictionary.com
WBY is a text and chat acronym that means what about you?
Dictionary.com