This term is from old-school computer days. In 1964, the term was shortened to GIGO. Both the term and the acronym refer to the fact that a computer will process any input data regardless of whether it makes sense and what results is gibberish for output. A well written compute program will reject input data that is obviously incorrect however such programs require considerably more effort to create.
The term and the acronym is the response most IT people will use when a non-IT person complains that a program didn’t perform as anticipated despite the fact that incorrect information was inputted. Over the past few years, the term and acronym have also been used to describe misfires in human decisions based on incomplete or inaccurate information.
Historically Speaking 