In early 2019, Pop Smoke released his debut single, “MPR”. This gained him buzz in the Brooklyn area. In January of 2019, he released “Flexing”, which received 100,000 views on YouTube within a day. Meanwhile, Pop Smoke befriended producer Rico Beats, who was acquainted with record executive Steven Victor. The three set up an interview, and in April 2019, Pop Smoke revealed that he signed to Victor Victor Worldwide, a subsidiary of Universal Music. In the same month, Pop Smoke released his breakout single, "Welcome to the Party", the lead single of his debut mixtape, Meet the Woo (2019) that was produced by 808Melo. The song was later remixed two times, one featuring Nicki Minaj and the other featuring Skepta in August 2019. The song was noted for its usage of UK drill production, later commonly seen throughout his discography. This was due to frequent collaborations with British drill producer 808Melo. Other well-known songs of his include: "Mpr", "Flexin'" and "Dior". Following the rise to popularity of "Welcome to the Party", he collaborated with other popular artists on singles such as: "War" featuring Lil Tjay and "100k on a Coupe" featuring Calboy. In December 2019, he collaborated on "Gatti" with JackBoys and Travis Scott, which is the last track on the JackBoys (2019) album by Scott and his Cactus Jack members.