Nize Your Beak 

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!

Nize Your Beak by FAM27 November 30, 2017

Nize your beak 

Short for "Recognize your beak". This meaning you better watch what you say fam

Straight from T-dot

Scrub: "Yo dawg ur a batty boy!"

Fam: "Nize your beak!"

Nize your beak by Dick_puncher69 May 21, 2017

nize your beak 

To shut up. Someone will you this if your getting on your nerves.

YO DAWG, NIZE YOUR BEAK.

nize your beak by iq-5000 November 16, 2016