Nau'Jour Grainger was born and grew up in Syracuse, New York, but later relocated to Raleigh, North Carolina at the age of 13.He started recording music at age 16, while playing high school football and figuring out his life path. Toosii was discovered by the South Coast Music Group. He signed with the record label in 2019.
He got his big break in 2019 with the release of the track "Red Lights", which went on to accrue millions of streams.[3] He then released his Who Dat mixtape on April 30, 2019, which was followed by the 13-track Platinum Heart mixtape on February 7, 2020. Platinum Heart reached number-one on the Billboard Heatseekers Album chart upon its initial release. The mixtape was later reissued as a 20-track deluxe version. On September 18, 2020, his third South Coast Music Group-affiliated album Poetic Pain was released as his first project on Capitol Records.
His signing to Capitol was made on September 30, by Chris Turner (A&R) following the release of his official video for "Love Cycle" with Summer Walker. Toosii was credited with 50,000 US adjusted sales and over 250 million combined global streams in 2020 at the time of this release. "Love Cycle" was later certified gold by the Recording Industry Association of America on January 11, 2021. His project Poetic Pain debuted at number 17 on the Billboard 200 chart in September 2020 and features the RIAA-certified gold single "Love Cycle" with Summer Walker.
On May 7, 2021, Toosii released his seventh mixtape, Thank You for Believing. The tape's title shows "gratitude to those that had faith in him and helped get him where he is today". It contains 13 tracks, and features Mulatto, Key Glock, and DaBaby. In 2021, he was featured on the XXL Freshman Class.
