Visit Google. Submit a query of two words, but don't use quote marks. (Quotes tell Google to find the enclosed words immediately adjacent - and that's just too easy!) Use no punctuation in your words, and no numbers (just 26 letters from A through Z). Find two words that return one result,
What are the rules?
Rule Number One: Your two Googlefactors must exist in Google's view of legitimate words in this dictionary. Not your view; Google's view! Google does the work, and Google has the final word on what may be legitimate! In the blue bar atop your Google results, accepted terms are linked, and so appear 'underlined.' No line, no link, or no legitimate word = Googlejack!
Rule Number Two: Google also is the arbiter of a whack's uniqueness. Look to the right end of the blue bar atop your Google results. If you see "Results 1 - 1 of (any number),' you found exactly one hit = Googlewhack!
Rule Number Three: Google shows you an excerpt of the page you whacked. Look at that text. If it's merely a list of words (such as a bibliography, concordance, encyclopedia, glossary, thesaurus, dictionary, domain names, or plain old machine-generated random garbage), No Whack For You!
If your Googlefactors don't comply, some other whacker will certainly test them, then expose your treachery to all!
3-2-1 Whack away everyone.