ex)
"I opened the group chat and everyone was fighting. 머선129?"
🌀 Multiple origins🌀 Multiple2020
originThe exact first source is uncertain, but the expression spread widely around 2020–2021 through online communities, streaming culture, and entertainment captions. It combines a dialect-like “머선” for “무슨” with 129 read as 일-이-구, making it a compact visual pun for “무슨 일이고?”
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