Situations where a character sustains severe mental shock or injury, faints or even dies from exposure to extreme moe.
The term originates from Tohno Shiki's epic statement in post #15722.
Not to be confused with pictures that invoke feelings of moe-ness in the viewer, which should go into pool #903.
According to topic #13960 this tag should not be applied to posts where characters just react to cute things, ie. post #2279158, post #1604017, post #2636079.