Slang way to tell someone to shut up, commonly used to replace vulgar, or obscene phrase such as Shut The F**K Up. Unknown by Teachers.
Arturo: Yo, Mark you're so ugly!
Mark: Nize Your Beak! Have you looked in the mirror?
Arturo: Yeah, what about you?
Mark: I said Nize Your Beak!
Mark: Nize Your Beak! Have you looked in the mirror?
Arturo: Yeah, what about you?
Mark: I said Nize Your Beak!
by FAM27 November 30, 2017
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Get the niendorf mug.Niven is a name that comes from the Celtic language. It means Royalty. Nivens are sweet, kind and humble but very stressful and ill-tempered.
"My Best friend is Niven"
by Le phagite December 26, 2019
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Get the nien mug.by Sencus April 5, 2022
Get the A Niren mug.-Dave "Check out my new car Mark, took me a year to save up for it."
-Mark "Right on Dave, nicenice indeed."
-Mark "Right on Dave, nicenice indeed."
by nulify2 December 4, 2009
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