What does NOOT mean?

I was listening to Vertigo NCS release, on YouTube and every comment underneath was like "IT'S HIGH NOOT NOOT."

• 98%-ITS HIGH NOOT NOOT
  2%- Random Comments

• It's high NOOT NOOT!!!!!!!

I'm not from an English background, so I don't understand what it means. Does anyone know?

Solution 1:

All the fuss derives from a mashed first-person shooter compilation made by someone called Hoby who has 96,000 subscribers on YouTube

In the clip, someone off screen repeats high noon several times (click on link). I believe high noot noot is a mock imitation of that expression, and has probably become a catchphrase among hardcore gamers.

UPDATED Toward the end of the video compilation, the shooter turns around and reveals himself to be Pingu. This is the link of that precise moment (02.47). Warning: keep the volume down on your speakers.

Disclaimer
I just limited myself to reading the semi-literate replies on YouTube page

Solution 2:

It depends on context, is your case it probably means "nonsense":

“Noot Noot”:

• is the sound made by the titular character from the British-Swiss children’s TV series Pingu. Due to its frequent utterance throughout the series, the soundbite of the catchphrase has been incorporated into a variety of pop music mash-ups and photoshopped images on Tumblr.

(knowyourmeme.com)