Most likely, when they were doing their research on ~gaos, they probably saw a random internet user saying kusogao and thought it was legit. Hence why it's "other sources," i.e. "I read it on the internet."

But even taking in consideration these meanings that don't translate well literally to English, there's just no way to get the labelled sense "(Intoxicated Euphoria)" from kusogao in Japanese.Kimi, Rito (2021). The History of Hentai Manga: An Expressionist Examination of Eromanga. FAKKU. p.222. ISBN 978-1-63442-253-6. Also, since these are memes, it's hard to tell when exactly they were made, so I'm using the earliest published date I could find. Despite its popularity, there have been some debates surrounding the use of ahegao in recent years. Some argue that its usage is sexist or objectifying due to its association with sexual arousal. Others argue that it is simply an expression of emotion and should not be judged based on its potential sexual connotations. These debates have not been resolved yet and are likely to continue for some time. In conclusion, ahegao is an expression of emotion that has been present in Japanese culture for centuries. You can tell toro is supposed to be "melting," kuso is "sh*t," gesu is "evilness," and ahegao is... well, points for effort, I guess.

Aggeler, Madeleine (19 July 2019). "Who Is Belle Delphine, the Gamer Girl Selling Her Bathwater?". The Cut. New York. Archived from the original on 13 July 2019 . Retrieved 20 July 2019. The earliest variant included the words written in Japanese, so you know the poster actually knew Japanese, or knew how to copy-paste. Either way, there was no kusogao then, there was only three faces, because kusogao isn't a thing. gesugao is actually on the mark, but gesu isn't "evil," it's more like scum, low-life, dishonest (e.g. Ginrou 銀狼 from Dr. Stone is gesui, but not evil.). Typically a scummy, evil-looking grin, fetishized because some people like sadistic girls, I guess. Again: this definition is incorrect. It's impossible for me to blame the user, though, because "melting" would be my first guess, too. Even if you were born in Japan you could guess it wrong. It's just a very misleading term in general.

The Ancient Origins of Ahegao

In 2015, an image by the hentai artist Hirame depicting various anime characters with the ahegao face circled the internet. Later that year, the pictures appeared on clothing. In May 2017, such images started appearing in western fashion, the clothes depicting among other works an image from the hentai Danke Dankei Revolution by Asanagi. This version is now sold by English-language hentai publisher FAKKU. As far as I'm concerned, kusogao is NOT a Japanese term, it's a word someone added to the English meme that doesn't actually mean anything in Japanese. The user "Gnashty Weeb" only ever wrote two posts, the other one posted on the very same day, 2015-10-22. This one: [ gesugao - urbandictionary.com, accessed 2020-05-27] Gesugao is any facial expression that is stylistically warped in a way meant to depict the “evilness” of a character. The toro in torogao doesn't mean "melting," but, instead, that the character looks drowsy, lethargic, so their eyes are drawn heavy, half-closed.