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
A pleasant memory that is ruined by an honest revisiting of the events, such as seeing a movie that you loved as a kid, only to realize that it was a horrible movie (i.e. Krull).
"Wow, I remember her as being totally hot, but look at these pictures. My whole memory of her has been Krulled."