Meade just read that out loud to me, and it caused me to do a search for the word "cannibals" in the book I had open in Kindle, Kurt Vonnegut's "Welcome to the Monkeyhouse." I was delighted to find that old Kurt had used the word in his delightful collection of stories, and the line is even one that other readers — 3 to be precise — have highlighted. (Kindle lets you see other people's highlighting.)
But he faced the problem that complicates the lives of cannibals — namely: that a single victim cannot be used over and over.The "he" is not, of course, a cannibal, just a man with a problem that cannibals have, the need to look for more victims.
As for that Finley Peter Dunne quote, Meade said it puts a different spin on the old saying "You are what you eat." If you are what you eat, you're a cannibal. That seems like something that's been said before, but the closest I get, Googling that, is somebody at Yahoo Answers asking "If you are what you eat then are Cannibals the only True Humans?" Before answering that yourself — assuming you feel so inclined — please read Michel de Montaigne's "On Cannibals":
I am not so concerned that we should remark on the barbaric horror of such a deed, but that, while we quite rightly judge their faults, we are blind to our own. I think it is more barbaric to eat a man alive than to eat him dead, to tear apart through torture and pain a living body which can still feel, or to burn it alive by bits, to let it be gnawed and chewed by dogs or pigs (as we have no only read, but seen, in recent times, not against old enemies but among neighbors and fellow-citizens, and--what is worse--under the pretext of piety and religion. Better to roast and eat him after he is dead.Recent times... in 1580.