Written by Montana, Pump, Jozzy, and its producers Diplo and Valentino Khan, it was released by Columbia Records on May 15, 2018, as the second single from the soundtrack to the film Deadpool 2 (2018).

"[1][2] "Welcome to the Party" is an uptempo trap song,[3][4] which sees Diplo returning to the pre-dubstep era of EDM for the production.

[7] Lyrically, Montana compares the size of his cash flow to human behemoth and NBA player Shaquille O'Neal in the opening verse.

[10][11] The official music video, directed by Jason Koenig, was released on May 21, 2018, and features the four artists partying and taking part in havoc and destruction interspersed with clips from the movie.

[13] A second remix with Juicy J and Famous Dex, an altered verse from Lil Pump, and without Zhavia Ward, was released on July 27, 2018.