An overwhelming and practical response from the fans to events in a TV series, book, film, etc.
The first nine hysterical women were Torchwood fans, who sent coffee and letters to the BBC protesting against the death of Ianto Jones. Over 900 people registered on one LiveJournal community alone.
Russell T Davies: "The 'controversy' over Ianto's death is just nine hysterical women."
Or:
If (character) dies this series, they'll have nine hysterical women on their hands.
To come face to face with an epiphany moment that results in an instantaneous burst of uncontrollable laughter for a prolonged period of time.
I suppressed the thought of being pregnant while getting through final exams followed by a trip to the pharmacy. As soon as I saw the result of my pregnancy test I broke out into hysterical laughter.