When did these acronyms come into vogue? And who originated them?
I learned them in law school . . . (??).
http://www.nytimes.com/1997/10/12/magazine/on-language-potus-and-flotus.html
Here’s a NYTimes article from 1997 describing the history of these acronyms.
Thanks!
I learned 'em from The West Wing. 
Episode 1, POTUS hits a tree with his bike.
I think they are/were also easy ways to communicate long titles on social media. When you only have 40 characters on Twitter, you need abbreviations!
They’ve been around for a long time as I recall!
DONTKNOWUS
how about TPOTUS: Tax Payers of the US?
https://www.quora.com/Where-does-the-acronym-POTUS-come-from-and-why-do-people-use-it
Quite a while before social media. 
I always thought it was a Secret Service code or shorthand.
tomSr–
so many jokes…just not allowed on CC.
If Hillary becomes President, what will they call Bill? FHOTUS just doesn’t look right, somehow.
FGOTUS First Gentleman…?
That looks even worse, especially if you try to pronounce it!
How about Bill? :))
How about we call Bill, “XPOTUS”?
^^ I like that!!