What is "googlewhack"

n. A Google search result consisting of a single hit, in response to a search on two separate words.

A Googlewhack is a type of contest for finding a Google search query consisting of exactly two words without quotation marks, that returns exactly one hit. A Googlewhack must consist of two actual words found in a dictionary. A Googlewhack is considered legitimate if both of the searched-for words appear in the result page. For example, typing an asterisk (*) into the Google Search Bar turns up no results.

Published googlewhacks are short-lived, since when published to a web site, the new number of hits will become at least two, one to the original hit found, and one to the publishing site.