Our expert says:
I have no idea. This is an entirely lay term with no medical / psychiatric meaning whatever. So ordinary people use it to mean whatever they think it means, and these meaning differ very widely indeed. They may be referring to an episode of a recogniozed, diagnosed, serious psych illness, or to a time when they were just very upset about something. So you'd have to ask anyone who used the words, what they were meaning or describing
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