"Weeb" or "Weeabo"
The term can be used positively as well as negatively, so you have to be careful when using it. A "weeb" is a non-Japanese person who is, however, a very big fan of Japanese culture. This person loves everything related to Japan, whether it's pop culture, manga, anime, or Japanese history and language. That's the positive side.
In contrast, a "weeabo" is defined as a person overly obsessed with Japanese Culture, resulting in the acquisition of Language, which expresses hairstyle and behavior. However, the distinction between the two terms is not so clear everywhere.
Where does the term come from?
In the 90's you could see a real wave of enthusiasm for everything related to Japan, triggered by manga and anime that conquered the whole world. The Japanese expression for fans "Otaku" was used here first. But, as always, when it comes to fanatical enthusiasm, there are those who are just as passionately opposed to it, and have found appropriate language to denigrate the fans.
This is where the term “Wapanese” comes into play around 2002. This word is compound and means "white Japanese" or "wannabe Japanese", i.e. "white Japanese" or "wannabe Japanese". This expression has spread rapidly over 4chan.
These swear words were sorted out by appropriate filters, which made the haters inventive. Nicholas Guewitch's "The Perry Bible Fellowship" is an online comic that uses the word "Weeaboo," which interchanges with "Wapanese," subverting appropriate filters.
"Weeaboo" is reduced to "Weeb".
Japan still has a touch of the exotic about it for many people. This may be because…
Where are "Weeb" and "Weebo" commonly used?
The two terms are used in a positive way nowadays, although one has to be careful in which context. It is a fan of Japanese culture in a good sense and someone disrespectful and immature towards a foreign culture in a negative sense. So this is where you need to be careful how you use Weeb. It is also not a word for the business sector, but is more to be used in the private context.