A dugout is a type of dwelling, shelter, or other structure that is created by digging a hole or depression into the ground. If this is meant to be a more permanent structure a slight above-ground structure with a roof, or basement like doors can be built above it to allow for consistent re-entry.
Back in the day dugouts were often carved into the sides of hills, embankments, or ravines and were protected by a crudely constructed front wall built with logs, leaved branches, or sod. Reverting back to this primitive shelter may be your best option when having to bug-out in a hurry.
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What OPSEC is and why preppers should use Operation Security strategies in there preparations and survival plans.
SHTF stands for "Shit Hits The Fan". A slang term referencing highly disastrous situations, crisis or catastrophe.