Alluah akbar Share definition Flag A phrase used by ISIS/Muslim terrorists that they say before committing acts or terrorism; Blowing something up. All these Isis idiots do is run around blowing stuff up yelling ALLUAH AKBAR! Alluah akbar by MemePleb July 22, 2016 0 0 Get merch Get the Alluah akbar mug. Buy Now — $32.95 See more merch