Casual abbreviation of "birthday", pre-dating social media (used in SMS and instant messaging since at least the early 2000s). Now universal in texting, social-media posts, and informal email. "Happy bday!" is the standard short-form birthday wish; "bday plans?" is the standard early-week opener for a friend whose birthday is approaching.
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Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.
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happy bday!! hope it's the best one yet 🎂
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