"XO Tour Llif3" (pronounced "XO Tour Life") is a single by American rapper Lil Uzi Vert from his EP Luv Is Rage 1.5 (2017) and debut album Luv Is Rage 2 (2017). It was released on March 24, 2017, by Generation Now and Atlantic Records. The track was produced by TM88, with co-production by JW Lucas. It peaked at number seven on the US Billboard Hot 100, becoming Lil Uzi Vert's highest-charting single as a solo artist and second top 10 entry overall after his feature on "Bad and Boujee" with Migos.

"XO Tour Llif3" began when Lil Uzi Vert started collaborating with producer TM88. Lil Uzi Vert originally contacted TM88 through FaceTime while TM88 was in Miami to work with rappers Future and Gucci Mane. TM88's return flight to Atlanta was delayed due to the 2017 Fort Lauderdale airport shooting and during the ten hour wait at the airport, TM88 lost his laptop charger. When TM88 returned to Atlanta, he couldn't access his laptop which led him to using an old computer and a Beats pill to produce during which, he found the instrumental for XO Tour Llif3. XO Tour Llif3 was originally a collaboration with another producer, J.W Lucas. TM88 sped up the original beat and chopped the intro and the first verse before using the Fruity Loops plugin, Gross Beat to manipulate the volume and the time of the instrumental.

The song is inspired by Lil Uzi Vert's relationship with Brittany Byrd and the couple's eventual break-up in June, 2016. Lil Uzi Vert talks about his issues with substance abuse, quoting Xanax saying "Xanny makes it go away" referring to the use of the drug to relieve the emotional pain from the break-up with Byrd. Lil Uzi Vert references money numerous times on the track, saying "All my friends are dead" citing the use of deceased presidents on banknotes.

On February 26, 2017, Lil Uzi Vert released Luv Is Rage 1.5, an EP consisting of four tracks, including "XO Tour Llif3", on his SoundCloud account. The song quickly amassed millions of plays and attention across social media, eventually resulting into a commercial release. The popularity of "XO Tour Llif3" resulted in the viral "Lil Uzi Vert Challenge".

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