The GIGO reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

GIGO

1. Garbage In, Garbage Out. A reference to the fact that computers, unlike humans, will unquestioningly process the most nonsensical of input data and produce nonsensical output. Of course a properly written program will reject input data that is obviously erroneous but such checking is not always easy to specify and is tedious to write.

GIGO is usually said in response to users who complain that a program did not "do the right thing" when given imperfect input or otherwise mistreated in some way. Also commonly used to describe failures in human decision making due to faulty, incomplete, or imprecise data.

For example, a badly written TeX document will look bad because the user did not correctly typeset the TeX source properly. This instance of GIGO could be described in a similar vein to WYSIWYG - what you see is what you asked for.

2. Garbage In, Gospel Out. This more recent expansion is a sardonic comment on the tendency human beings have to put excessive trust in "computerised" data.

See also: KIBO

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