Gaslighting is a form of psychological abuse where someone is made to question their perception of reality. (The term is derived from the film Gaslight where the husband lowered the gaslight incrementally and told his wife the light had never been changed.)
Ghosting is a method of terminating a relationship by suddenly withdrawing from all communication without explanation.
Gaslight ghosting, also called Extreme Ghosting, means to make someone question their perception of reality by withdrawing all communication without explanation.
In other words, the practices that most employers inflict on their employees.