Oh boy, it's been a while hasn't it?

The origin of this ever-present word is a little vague. We know it originated around the time when the Anglo-Saxons were inhabiting England, along with the vast Christianizing of the popular isle. The previously pagan Anglo-Saxons adopted the Christian religion whole-heartedly and took in all the gory details of the Bible. Being quite fearful of the ultimate end, they were fond of bidding each other good day with a hearty "Mae de Haelle outen" (May hell not be in ye). This eventually condensed to "Haelle out" and then merely "Haello", which through the changes of Old to Middle to Modern English became "hello".