kimchi baby Share definition Flag One who is far too immature for their age. Can also mean moronic, but is used as a noun and not an adjective. That 30 year old man still watches Blue's Clues, What a Kimchi Baby! kimchi baby by BigScratch June 1, 2014 0 0 Get merch Get the kimchi baby mug. Buy Now — $32.95 See more merch