stan behavior
intense
the one-line answer
Acting with the intensity of a dedicated fan toward someone or something.
Stan behavior is the kind of intense devotion that stans display. Defending everything. Knowing every detail. Being emotionally invested beyond what is typical.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
observation
the way she defends him online is pure stan behavior.
Her defense of him is more intense than a normal fan would exhibit.