“Last Friday Night (T.G.I.F.)” is a song by American recording artist Katy Perry. The song was produced by Dr. Luke and Max Martin, who also co-wrote the song with Perry and Bonnie McKee at Playback Recording Studio for Perry’s third studio album, Teenage Dream.

Musically, the song is a prominent NRG-pop song with dance-pop influences, while the lyrics are about drunken fun and debauchery. Some of the risque lyrics in the song are often censored in radio versions of the song. The title “T.G.I.F.” is an acronym for “Thank God It’s Friday”.

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