"Hoot" (Hangul: 훗) is the lead single from Hoot, the third EP of South Koreangirl groupGirls' Generation. It became the ninth hit song for the group, topping various off- and online charts. "Hoot" was released on October 25, 2010. A Japanese-language version was also released on their first Japanese album, Girls' Generation on June 1, 2011.
"Hoot" was originally titled "Bulletproof" and written with English lyrics. It was composed by Danish songwriter-producers Martin Michael Larsson and Lars Halvor Jensen, of Deekay, together with British songwriter Alex James, with the intention of creating an "exciting up-tempo record for a female artist or group". The song demo was written and recorded in the UK, with Nina Woodford singing the vocal, and then finished and mixed in Denmark. Their publisher, Pelle Lidell of Universal Music Publishing Group, successfully pitched the song to S.M. Entertainment for Girls' Generation. Jensen later told HitQuarters: "We knew it was a strong record and a lot of the time you have to be patient until you find the right artist to cut it at the right time. Girls' Generation were that match." The song was then translated into Korean, but incorporated some of the original English words such as "trouble, trouble, trouble".
The music video contains two settings: a white room and a black room. Throughout the video, there are scenes of the girls dancing in the black room dressed in black short suits with pink belts and high boots and in the white room dressed in golden suits with silver boots, but also in the beginning the girls are seen dancing in an elevator. In the music video are individual close-ups of their own unique personality.