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This is a chinese slang, which is the initials for “Ni Ma Si Le” which means your mom’s dead. Often used in curses for online/real life arguments.
A: You’re nothing but a keyboard fighter, suck it.
by BlahMaster July 18, 2018
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The word "NMSL" is a pinyin(Chinese typing/pronunciation system) abbreviation of the Chinese phrase "你妈死了", which translates to "You mother died". The word is used as an insult mainly online and is a part of modern Chinese internet culture. The word gained popularity when mainland Chinese people, mostly teens, circulated government censorship to post pro-China propaganda on western social media and used this word to insult people who said anything negative about China
A(In a post): #StandwithHongkong
B(in comments): NMSL

A: Taiwan is an independent country:

A: China is suppressing human rights, the government has...\
by #StandwithHongkong October 06, 2019
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The abbreviation of "Never Mind the Scandal and Libel".(First time used by a famous Chinese rapper Sun Dog in his famous song "Showtime").
Kris Wu NMSL.
by #97 July 30, 2018
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