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Popular in Austin, Texas, since the mid-1970s, as a variant of "hello". It is part of what is referred to as krelltalk, which originated after a group of Austinites saw a UFO while tripping in the mid 1970s and encountered an extraterrestrial. The alien recalled the movie "Forbidden Planet" and the extinct alien species, the Krell. Thereafter, krello became a substitute for hello and krellwell became a substitute for farewell
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