"Blueberry Faygo" is a song by American rapper Lil Mosey. The song was made and leaked on June 5, 2019, when multiple imposters distributed bootleg versions of the song onto Spotify, racking up millions of streams, before being removed. The song's release was delayed due to a sample clearance agreement and was eventually released on February 7, 2020, by Mogul Vision Music and Interscope Records. It was released concurrently with the reissue of Lil Mosey's second studio album Certified Hitmaker (2019), which the single appears on. It is Mosey's most successful song to date, peaking at number 8 on the US Billboard Hot 100, and is his only top 10 entry on the chart. On February 26, 2022, about two years after its release, it surpassed one billion streams on Spotify. The song's title refers to Faygo, a brand of soft drinks. The song has since come to be regarded as Lil Mosey's signature song.