ex)
"I opened the group chat and everyone was fighting. 머선129?"
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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