bunkie

noun

1. A bunkmate, someone with whom one shares a bunk bed.
2. Familiar term of address.

   “Excuse me, bunkie. Don't you have anything useful to do?”

3. a small cabin with a bunk or bed(s), a free-standing bedroom or sleeping area separate from the main house or cottage, which may or may not have other facilities (a fully outfitted outbuilding with a kitchen or bathroom would be a guest house or accessory dwelling unit and not a bunkie)