IKL! Share definition Flag abbreviation for I Know Left, opposite to IRK! and implies that the person your saying it to is lying Guy1: I'm straight Guy2: IKL! Guy1: Dude, that was UNCOOL IKL! by FAYEOVESDIABETICS!!! June 2, 2010 0 0 Get merch Get the IKL! mug. Buy Now — $32.95 See more merch