머선 129(일이고) - 난닝구

• 머선 129 (Meoseon 129): Sounds like "Muh-sun one-two-nine." "Muh-sun" is pronounced like 'muh' in 'muffin' followed by 'sun' as in 'sunshine'. The "129" is pronounced as the English numbers "one-two-nine."
• 난닝구 (Nanninggu): Sounds like "Nan-ning-goo." 'Nan' as in 'nanny', 'ning' as in 'singing' (without the 's'), and 'goo' as in 'goose'.

"Meoseon 129" began gaining popularity from late 2020 to early 2021. It originated from the Gyeongsang-do dialect phrase "머선 일이고" (Meoseon Iligo - "What's going on?"), frequently used by AfreecaTV BJ Nanninggu. Streamer Ralo later transformed it into "Meoseon 129," leading to its widespread recognition online. In December 2020, it became a mainstream catchphrase after being used as a subtitle for Kang Ho-dong's line in the TV variety show 'New Journey to the West'. It even reached international fans when BTS's RM used it.

"Meoseon 129" is a neologism that phonetically transforms the Gyeongsang-do dialect phrase "무슨 일이고?" (Museun Iligo? - "What's going on?"). The "일이고" (Iligo) part is replaced with the numbers "129" due to their phonetic similarity. It is primarily used to express "What's happening?" or "What's going on?" in absurd, unexpected, or surprising situations, carrying a lighthearted and humorous nuance.

This meme initially spread among internet broadcast viewers, particularly young generations who watched BJ Nanninggu and streamer Ralo, and enjoyed mobile and online games. It subsequently expanded to all age groups, being actively used in various online spaces such as internet communities, social media, and stock discussion forums. Its use in TV variety shows and by K-POP idols further boosted its public awareness. It is especially prevalent among those active online, showing a broad usage tendency from teenagers to people in their 40s.

• "OMG, Meoseon 129!"
• "What's up with this test difficulty, Meoseon 129?"
• "I'm late, but the professor isn't here, Meoseon 129."
• "Sudden heavy rain, Meoseon 129…"
• "New item price, Meoseon 129;;"
• It is also used in the stock market when stock prices fluctuate rapidly.
• Used in messenger conversations (e.g., KakaoTalk) when an unexpected situation occurs.
• "Sudden rain... what is this Meoseon 129 ㅠㅠㅠ"

"Meoseon 129" is a neologism based on the Gyeongsang-do dialect and is primarily used humorously in informal settings. Therefore, it is advisable to refrain from using it in formal situations or where politeness is required. Additionally, its meaning might not be easily understood by older individuals who are unfamiliar with internet memes.