leek Share definition Flag The small, little green sprig of onions that Farfetch'd (The Pokemon) carries with it at all times as a weapon. Please cook the Farfetch'd with the Leek as seasoning, please. leek by Scooby Doo Doo October 8, 2003 0 0 Get merch Get the leek mug. Buy Now — $32.95 See more merch