Having a Ninge Share definition Flag To behave like a Ninja for a period of time. To act in a very sneaky manner for the purpose of overcoming ones goals. "Has anyone seen Dave?" "Nah, pretty sure he's off having a ninge." Having a Ninge by Tedsvilles June 18, 2014 0 0 Get merch Get the Having a Ninge mug. Buy Now — $32.95 See more merch