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What Does UMBJ Mean?UMBJ means "You Must Be Joking."
Summary of Key Points"You Must Be Joking" is the most common definition for UMBJ on Snapchat, WhatsApp, Facebook, Twitter, Instagram, and TikTok.
|Definition:||You Must Be Joking|
2: Quite easy to guess
Adults and Teenagers
Example of UMBJ Used in a Text
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