When he found out his favorite character died in the episode, he screamed 'Noooo' at the screen.

Noooo 是 no 的夸张拖长发音形式，通常用于表达极度震惊、拒绝或悲痛的情绪。这种拖长元音的写法在口语表达中常见，用来强调说话者的强烈情感反应。