Costco Chef Share definition Flag I person who thinks they can cook but in reality they are just good at heating up frozen meals from costco. My mom thinks she is a 5 star cook, but in reality she is just a costco chef. Costco Chef by Scott J. F. March 22, 2010 0 0 Get merch Get the Costco Chef mug. Buy Now — $32.95 See more merch