Trebor Nooooo circulates online as a reaction sound with no confirmed original source, passed around soundboards simply for the exaggerated delivery. The humour comes from how specific the name sounds against such a universal scream of disbelief, so creators reuse it even without knowing who Trebor is. It has become a shorthand for mock tragedy in short videos, gaming clips and group chats, where the long drawn out wail signals a loss that is played entirely for comedy.