"Born Slippy .NUXX" is a song by British electronic group Underworld. It was released in July 1996 as a single and preceded in January 1995 by a release of the similarly named but completely different track "Born Slippy", which featured "Born Slippy .NUXX" as a B-side.

"Born Slippy .NUXX" was released as a single in its own right in the wake of the 1996 Danny Boyle film Trainspotting, where it could be heard in the final scene. The film stoked immense public interest in the track, helping the single peak at number 2 on the UK Singles Chart in July 1996. The Trainspotting soundtrack album credits the track as "Born Slippy", only in the inner liner notes listing it as "Born Slippy (NUXX)".

The track has since appeared on many compilation albums and mashup records, and has been remixed. It has been played at nearly every Underworld live performance since 1996. In 2004, It was voted the 4th best dance track ever by readers of Mixmag magazine. In 2014, NME named it the 261st greatest song of all time.Pitchfork Media named it the 31st best track of the 1990s.The Guardian called it, alongside the Chemical Brothers' "Setting Sun", the "most experimental and sonically extreme hit [single] of the 90s." The newspaper also named it among "the weirdest chart [hits] of all time."

The band has said that the pounding, relentless rhythm and shouted lyrics of the track were originally meant "as a joke", and the single received little attention. They have also said in a The Guardian interview that the song is intended to sound like an alcoholic's internal dialogue and that Karl Hyde was an alcoholic at the time. Underworld have claimed that the ".NUXX" name was inspired by a computer fault that added that suffix to the name of their working files.

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