YMBJ
YMBJ definition by Slang.net - The Slang Dictionary
This page explains what the acronym "YMBJ" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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YMBJ stands for "you must be joking." This acronym is another way of saying "Are you kidding me?"
If someone sends you YMBJ and you actually were joking, you can respond with JK to let the person know their intuition was correct. If you weren't joking, you can send back IDS or tell the person that you're srs.