What Does "SHTF" Mean, and Why Does Caliber Matter? In the preparedness community, SHTF is shorthand for a famously blunt phrase in which the S is exactly the word you are thinking of, followed by "hits the fan." But for our purposes, we will be saying "stuff hits the fan." SHTF describes any large-scale disruption that upends normal life: a natural disaster, a long-term power outage, an economic collapse, or a supply chain breakdown. When normal systems stop working, the things you planned for …