The phrase comes from Brazilian gaming slang, where 'tô ownando' is a boast borrowed from English 'owning', meaning to dominate opponents completely. Clips with this kind of live voice chat brag spread through game highlight edits, short videos and soundboards because the delivery is instantly readable even without context. It survives as a reaction sound rather than a quote from a known show or film, reused whenever a player wants a loud, overconfident celebration for a win, a streak or an embarrassing defeat for the other side.