Left Hand Path
The use of this term in occultism came from a term used in Hindu Tantra, Vama marga in Sanskrit. This ancient form of tantra used the breaking of rules (taboos) as part of the practice. Rules about diet and sex were broken on purpose. For example, rules against eating meat and drinking alcohol might be broken. Such a practice might require eating meat and drinking alcohol while having sex in a graveyard or cremation ground.
People who follow the Left Hand Path in the West are not interested in giving up pleasure or the world in order to be spiritual. They are not interested in worshiping God or following rules made up by others. They seek to gain power and freedom by breaking through taboos, fears and restrictions.