Shinju-a-eh! Share definition Flag A ninja expression that means someone who gesticulate like an idiot to frighten his enemy. Holding an imaginary katana. "Shinju-a-eh!" Shinju-a-eh! by Afr0Samura1 September 3, 2010 0 0 Get merch Get the Shinju-a-eh! mug. Buy Now — $32.95 See more merch