Never heard about this term before, but came across it by chance in the de comments section of a funny video one of my friends sent.
The commenter used the term “oligophrenic” to describe the retarded woman so I had to look it up since I didn’t know what it meant. The wiki page made me crack up! 😹
I learned many new things, also which terms (and when) to use them when I eventually come across colorful characters in the near future. lol
I didn’t find the wiki in English. In the References section down below you’ll find the link to the Spanish wiki page. Use Google Translate to translate it. It should do a good job of translating it.