Yahoo! was originally an acronym for "Yet Another Hierarchical Officious Oracle."
If it doesn't stand for that any more, then it must stand for Jonathan Swift's fictional Yahoos, creatures that were "filthy and with unpleasant habits, resembling human beings far too closely for the liking of protagonist Lemuel Gulliver.... The Yahoos are primitive creatures obsessed with 'pretty stones'they find by digging in mud, thus representing the distasteful materialism and ignorant elitism Swift encountered in Britain. Hence the term 'yahoo' has come to mean 'a crude, brutish or obscenely coarse person."
A pity that they are doing this. As time goes on and SEO gets cleverer and cleverer, I find that Google's searches are becoming less and less good, and it would seem that a human-generated directory would start to become useful once again.