'Spatchcooking' sounds like some silly made-up word another dipshit hausfrau thought would be cute to use on her bridge club buddies. Does a spatch exist as an object? Probably not. Butterflying (at least in my opinion) only makes sense on a single cut of meat like a filet, chop. or breast and doesn't apply to a whole bird. If you're not some pretentious snob/insecure DUmmy who needs to invent words to make yourself feel better, how about "cutting up into smaller pieces so it cooks faster".
Oops. Too many words.