This is a collaboration between Gunna and Lil Uzi Vert that leaked on August 10, 2018.

The original file that leaked listed only the people involved in making the song and the date it was recorded in the filename (“GUNNA UZi Wheezy SHAANRUFF – 4-29-18.mp3”), which tells us that this is a Gunna song, featuring Lil Uzi Vert, produced by Wheezy, recorded/mixed by Shaan Singh on April 29, 2018, and a rough mix, not the final. “.223” is the name fans gave the song after it leaked, because it was otherwise untitled.