K.O. is a song by Brazilian drag queen Pabllo Vittar, released as the third single from her debut album Vai Passar Mal (2017). The song was written by Rodrigo Gorky, Maffalda and Pablo Bispo. It was released on April 19, 2017 by independent label BMT Produções. The music video was released on the same day, directed by João Monteiro and includes Malcolm Matheus as a guest, from Rede Globo's program Amor & Sexo.

The track was officially released on April 19, 2017. On Spotify, the song reached 15.3 million streamings and became the most successful song by a drag queen. It was also the most heard song in July 2017 in Spotify Brazil.

Without a record label, the song had difficulty getting radio airplay, so with its popularity on the internet with several covers, the track ended up being conveyed by popular demand. Thus, the song debuted on Brasil Hot 100 Airplay and Hot Pop & Popular at numbers 78 and 16, respectively.

The video was filmed on March 24, 2017. It was directed by João Monteiro, who directed videos for also drag queens Aretuza Lovi and Gloria Groove. Malcolm Matheus plays a boxing fighter. The music video reached 2 million views in two days and soon consecrated itself as the most watched music video by a drag queen with 26.1 million views, beating Vittar's own record with Todo Dia. As of September 2017, K.O. has surpassed 160 million views on YouTube.

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