A word often used to refer to a butterflies chicken is spatchcock. So what is the origin of the word spatchcock? "According to the The folks at Oxford think it's Irish, and a combination of "dispatch" (as in "quick") and "cock," but the Random House Webster's College Dictionary dismisses that theory and ties the word to "spitchcock," a dish made with fried eels. Even if one likes fried eels (which I do not), this isn't very useful because no one seems to know where "spitchcock" came from, either." www.word-detective.com.