I was thinking more along the line of ghost busters
Looking in the dictionary
the more viscous, clear outer layer of the cytoplasm in amoeboid cells.
a supernatural viscous substance that supposedly exudes from the body of a medium during a spiritualistic trance and forms the material for the manifestation of spirits.
I am guessing you will go with 2
So looking up what a medium is https://en.wikipedia...wiki/Mediumship "Mediumship gained popularity during the nineteenth century, when ouija boards were used by the upper classes as a source of entertainment. Investigations during this period revealed widespread fraud—with some practitioners employing techniques used by stage magicians—and the practice began to lose credibility. Fraud is still rife in the medium/psychic industry, with cases of deception and trickery being discovered to this day."
It is on Ghostbusters that is for sure. and same thing I thought. Since you like Wikipedia this is what they say.
The idea of ectoplasm was merged into the notion of an "ectenic force" by some early psychical researchers who were seeking a physical explanation for reports of psychokinesis in séances. Its existence was initially hypothesized by Count Agenor de Gasparin, to explain the phenomena of table turning and tapping during séances. Ectenic force was named by de Gasparin's colleague M. Thury, a professor of natural history at the Academy of Geneva. Between them, de Gasparin and Thury conducted a number of experiments in ectenic force, and claimed some success. Their work was not independently verified.
Other psychical researchers who studied mediumship speculated that within the human body an unidentified fluid termed the "psychode", "psychic force" or "ecteneic force" existed and was capable of being released to influence matter. This view was held by Camille Flammarion and William Crookes, however a later psychical researcher Hereward Carrington pointed out that the fluid was hypothetical and has never been discovered.
The psychical investigator W. J. Crawford (1881–1920) had claimed that a fluid substance was responsible for levitation of objects after witnessing the medium Kathleen Goligher. Crawford, after witnessing a number of her séances, claimed to have obtained flashlight photographs of the substance; he later described the substance as "plasma". He claimed the substance is not visible to the naked eye but can be felt by the body.
The physicist and psychical researcher Edmund Edward Fournier d'Albe later investigated the medium Kathleen Goligher at many sittings and arrived at the opposite conclusions to Crawford; according to D'Albe, no paranormal phenomena such as levitation had occurred with Goligher and stated he had found evidence of fraud. D'Albe claimed the substance in the photographs of Crawford was ordinary muslin. During a séance D'Albe had observed white muslin between Goligher's feet.