hair in own mouth
When a character is holding a lock or single strand of their own hair in their own mouth. Often used as a visual shorthand for derangement, e.g., on yandere characters, but also sometimes just used as a sign of general dishevelment.
See eating hair for when someone is chewing on someone else's hair. See stray pubic hair for when someone has pubic hair in their mouth.
See also
The following tags are aliased to this tag: hair_in_mouth (learn more).