Used to describe a final/minor step or issue in a computer/software
repair that becomes in itself a major issue.
A 'columbo' is named for a the TV show detetective by the same name who was known for his phrase at the supposed end of his questions/investigation "oh yeah,
one more thing" - and USUALLY that 'one more thing' is the 'kicker'
as it were.
It took me
six hours to
fix it because I had a columbo.
That airbook
setup had more columbos than I could count!