Short for problem exists between keyboard and chair, PEBKAC is a term used by computer technicians and IT (information technology) professionals to describe a user error. The term asserts that the user is to blame when referring to the technical issue at hand; not the installed software or the device itself.
For those who didn’t know like me:
https://www.computerhope.com/jargon/p/pebkac.htm
Honestly, a pretty funny phrase despite its dickishness.