Etymology

Uncertain: possibly from Cruft Hall, the name of the radar laboratory of Harvard's physics department during the Second World War, which contained much old and unused technical equipment; possibly a blend of crust and fluff, both of which suggest things that are obsolete and superfluous; possibly a modified form of crust. The supposed acronym "commodity residue undergoing fanciful transit" is a backronym.

Noun

1. Anything old or of inferior quality.
2. Redundant, old or improperly written code, especially that which accumulates over time; clutter.