Animal magnetism (French: magnétisme animal; Latin: magnetismus animalis), in modern usage, refers to a person’s sexual attractiveness or raw charisma. Originally the term referred to a supposed magnetic fluid or ethereal medium that resided in the bodies of animate beings (i.e., those who breathe), as postulated by Franz Mesmer. The term translates Mesmer’s magnétisme animal. Mesmer chose the word “animal” to distinguish his supposed vital magnetic force from those referred to at that time as mineral magnetism, cosmic magnetism and planetary magnetism.
Definition courtesy Wikipedia.