Dirty Niall Share definition Flag A guy who teases you with shelfies for months but never takes it any further. "How are things going with that guy from work?" "Urgh, I gave up, he was nothing but a Dirty Niall" Dirty Niall by VintageKittyQueen May 28, 2023 0 0 Get merch Get the Dirty Niall mug. Buy Now — $32.95 See more merch