All you have to do if this happens is carefully rub warm water on the membrane encasing the chick and that should loosen it up enough to be able to break out of the shell. If not treated/helped the chick can die in the shell.
In the chicken world it is when the membrane surrounding the chick dries and the chick is unable to extract itself from the shell. i agree with previous poster its real meaning is when items get shrink wrapped for shipping, Pallets of goods are shrink wrapped with film and batteries are shrink wrapped with that stuff that is indestructable LOL.
A lot of people beleive the drying can come from opening the incubator during hatch. Lots of info on this board about how to help when needed.