Could this simply be described as the joy of using abbreviations?
For example PAT (in this case shouted) could be an abbreviation for a forename or an abbreviation for other descriptions (Positive Anchor Terminal, Principal Action Technologist, etc.). The same may also be said of your other examples I`m sure.
In many ways I suppose it is done in an attempt to bring back some meaning of what we are talking about, I am having some PAT done, or my CISS does not work does not convey a great deal to many people. The question that could be linked should be why do we abbreviate the spoken text in the first place.
Lots of acronyms and abbreviations have found their way into the language and are comprehensible - in some cases, more comprehensible than the longer phrase they replace - but I can't stand lazy writing or speaking which uses abbreviations or acronyms that nobody understands. I'd never heard of PAT or CISS, for example.