Fish-hooking

Fish-hooking is the act of inserting a finger or fingers of one or both hands into the mouth, nostrils or other orifices of a person, and pulling away from the centerline of the body; in most cases with the intention of pulling, tearing, or lacerating the surrounding tissue. Forceful fish-hooking involves a high risk of permanent facial or orifice damage. Sometimes, the term fish hooking refers to a type of eye gouging.
Fish-hooking techniques are disallowed in modern combat sports, mixed [martial arts] and martial arts competitions due to the risk of permanent injury. This technique is, however, occasionally taught as part of self-defense curricula in some martial arts such as Krav Maga and Gōjū-ryū karate, and used to be part of catch wrestling as well.