a rule of thumb stating that when faulty data are fed into a computer, the information that emerges will also be faulty.
Origin of GIGO
1965–70; g(arbage) i(n) g(arbage) o(ut)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
n acronym for computing slang
garbage in, garbage out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012