ahegao

Etymology
From, from  +.

Noun

 * 1)   An exaggerated facial expression consisting of flushed cheeks, rolled-back eyes, and the tongue hanging out, intended to depict a person having an orgasm.
 * 2) * 2017, Carolina Lindström, "'The power of characterization': A comparative analysis of the transformative works created by the English-language and Japanese-language fandoms of BBC Sherlock", thesis submitted to Stockholm University, page 26:
 * During the set of intercourse at the end of the story, Sherlock is also drawn featuring ahegao expressions, frequently used in hentai or pornographic works.
 * During the set of intercourse at the end of the story, Sherlock is also drawn featuring ahegao expressions, frequently used in hentai or pornographic works.

Translations

 * Chinese:
 * Mandarin: 阿嘿顏
 * Japanese: アヘ顔
 * Korean: 아헤가오
 * Persian: آهگائو
 * Russian: ахэгао
 * Tajik: аҳегао
 * Ukrainian: aхеґао