from urbandictionary.com: A word, normally repeated three times [as in homina homina homina], to express shock, befuddlement, or general speechlessness. Often when looking at a particularly attractive member of the speaker's favored sex. It probably comes from Ralph Kramden on "The Honeymooners." Attractive Female: Hello. Me: Homina homina homina.
I first saw this used, I believe in a comic book, by a character who had just narrowly avoided some potentially fatal violence.