The phrase comes from Dota commentary, where a caster used it to mark a play so unusual it seemed unmatched in the game's history. Clipped from that broadcast moment, it spread through gaming videos, streams and reaction edits as a shorthand for disbelief at something extraordinary. It has stayed popular because it is short, quotable and instantly understood by viewers who follow competitive games, even when it is applied to non-gaming moments for comic exaggeration.