8+1 Share definition Flag A gun, specifically a 9 milimeter (8+1=9). Used frequently in rap music. In the Wu-Tang Clan's song "Da Mystery of Chessboxin'" Ghostface Killah proclaims "So grab your 8+1, start flippin and trippin/Niggaz is jettin i'm lickin off son" 8+1 by D-Mills April 9, 2007 0 0 Get merch Get the 8+1 mug. Buy Now — $32.95 See more merch