It's usually nothing good, but I'm sure you figured that much out already.

[ He pauses his writing again, taking a moment to fish what definitions he knows up out of his memory. ]

Usually it represents sudden change or disaster. Upheaval. Something big and traumatic and unavoidable. Sometimes it's associated with pride or falsehoods, like all that you believe is a shaky foundation.

[ Gee, doesn't that sound familiar. ]

So, you know, fucking great club for us to be a part of.