Mr. Lackluster Share definition Flag Someone who performs poorly at any given task. Usually fortnite only up or fortnite box fights. Person 1: "You are Mr. Lackluster."Person 2: "Don't call me Mr. Lackluster." Mr. Lackluster by AriZonaTeaStan July 18, 2023 0 0 Get merch Get the Mr. Lackluster mug. Buy Now — $32.95 See more merch