What does CRUD stand for?

Carbon, Rust, and Undesirable Dirt - Facetious interpretation of what collects on objects left unprotected - Automotive engineering

Chalk River Unidentified Deposit - Nuclear energy (GFGA)

Continuous and Random Unwanted Deviations (SAUS)

Create Retrieve Update and Delete

Create, Retrieve, Update, Delete - Computer science (VLIE)

Create-Retrieve-Update-Delete (RALS)