Wbu, an abbreviation for "what about you" is very similar to hbu. It is used in messages when people cba to type out every word
Person One: How are you?
Person Two: Good thanks, wbu?
Person One: I'm ok.
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How about you (how 'bout you) or "hbu" for abbreviation is a text message phrase to ask a question in return to someone.
Person One: How are you?
Person Two: Good thanks, hbu?
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