ahegao
Ahegao (アヘ顔, lit. "ahe face", where "ahe" is a sound effect for wild moaning) is an orgasmic facial expression where the eyes are rolled up, the mouth is open, and the tongue is sticking out. Frequently accompanied by blushing, drooling, sweating, raising the eyebrows, or a double V gesture.
This expression usually (but not always) indicates a state of exaggerated sexual pleasure. It can also indicate craziness, drug influence, or asphyxiation.
Not to be confused with torogao, which is an expression that usually indicates a state of trance-like pleasure. Ahegao is a more wild expression. Basically; is she looks manic or like she’s laughing it’s this expression, if she looks sleepy or zoned-out it’s the other one.
Examples
