"It's Over 9000!", also known as simply "Over 9000!", is an Internet meme that became popular in 2006, involving a change made for English localizations of an episode of the Dragon Ball Z anime television series titled "The Return of Goku", which originally aired on April 19, 1997. The phrase is typically used as an innumerable quantifier to describe a large quantity of something. Variations of the phrase are also employed as a form of trolling.
The phrase refers to an alteration of the original line spoken in Japanese by the Saiyan character Vegeta, voiced in English by actor Brian Drummond, in the 21st episode of the Ocean Productions English dub. In the original Japanese and English-translated manga as well as the original Japanese anime series, the power level of series protagonist Son Goku is actually read as "over 8000!" (8000以上だ…!, Hassen ijō da…!)."