SFD is everything and nothing. You can use SFD in any manner of speech, for any reason, and at any time.
Arch - Hey, how was the weather down there?
Jade - Well today there was a 40% chance of SFD.
Arch - Nice, better than up here! No a SFD in sight!
Jade - Well ain't that an SFD if I ever did hear one.
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