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Langwing is a mis-spelled version of the word language.
It was a running gag in episode 108 of the youtuber Jacksfilms series Your Grammar Sucks
It is used much in the same way as the "Watch your profanity" meme as in it can be used in a serious way and joking
Comment 1: You are is motherfucker
Comment 2: Yo watch your langwing
Jack: What the fudge
Bob: Yo watch your langwing
The thing stupid people say to someone that curses. Referenced in one of jacks film's videos
F.ck that.
Hey! Watch your langwing!