Unless there's a metaphorical meaning that I don't know about, but shotgun home layouts are da bomb. Highly recommend.
Admittedly, it isn’t a very crowded field.
https://en.wikipedia.org/wiki/Shotgun_house
He also stated that the term "shotgun" is a reference to the idea that if all the doors are opened, a shotgun blast fired into the house from the front doorway will fly cleanly to the other end and out at the back.