The moment when a character realizes that something awful has happened, or notices that something awful is about to happen, and screams "NOOOOOOOOOOOOOOO!" It can also be used when a character is angrily refusing to do something. Screams of "NOOOOOOOOO!"are even in other Legoboynj shows like The Tale of El Nudelo.
In A Diamond Heist, El Nudelo Spider yells this when he realizing he was in hell. Cactus and Trowel also yell this in slo-mo when the Tombnesian Diamond accidentally falls out of Cactus' arms and breaks to smitherines.
This also happened in the episode "A Perplexing Massacre", when Magazine yells this when Biscuit scared her and her phone got smashed.
Also in Kiloto The Minoto, Whipped Cream yells this when Paint got squashed by the spikes. Beer also yelled this when his sister Wine threw his phone in the lake.