[E4YomzYIN5YEBKe]

I've heard of "mong" as short for "mongoloid" but I've never heard of "monogo" being used that way. Searching through Google books most of the results for mongo refer to the Mongo people of the Congo. The second most common source is the fictional planet Mongo from the Flash Gordon comics.

[carapace]

Maybe Google is being Politically Correct?

https://www.urbandictionary.com/define.php?term=Mongo