cockerill Share definition Flag A boy usually under the age of 18 who has wildly devoleped faster than his pears. This boy usually has a lot bigger penis than other boys his age. Hey, Johny has been such a Cockerill lately. cockerill by Areil October 9, 2007 0 0 Get merch Get the cockerill mug. Buy Now — $32.95 See more merch