"Garbage in Gospel out" is a more recent expansion of the acronym "Garbage in Garbage out". It is a sardonic comment on the tendency to put excessive trust in "computerized" data, and on the propensity for individuals to blindly accept what the computer says. Because the data goes through the computer, people tend to believe it (from wikipedia)
I have this awesome model, but the input parameters I've got are wrong. Any results I get would be so GIGOOO!