I had to look that up to confirm what it meant in the U.S.
It's what we would have called an "outside toilet" and these were not uncommon at one time. We use the term to mean any separate building eg a workshop or storage room.
My great-grandparents had one on the farm. They got an indoor toilet somewhere around 1956 or so, but my great-grandfather wouldn't use it. I hated using the outhouse and was glad when the indoor facilities went in.
Camping as a child, usually that was all that was available in the campground. An outhouse and a central spigot.
Yes, but on a farm when I was young. Can't remember whose farm, though. Kinda creepy. I don't much like port-a-potties either. My freshman roommate grew up on a farm and didn't have an indoor bathroom until she was a teenager. Man, did that shock this city girl!
I don't remember the circumstances, but, when I was a kid, I used one. The wood to build it was really thick. The odor was horrendous -God ,it stunk!! I couldn't believe you just left it there, without flushing.
Yes, when camping and hiking.
My husband's grand parents didn't have indoor plumbing until they moved in the mid 1980's. They had an outhouse, chamber pots, and an outdoor hose {if you wanted a shower}.
I once owned some land with an outhouse on it. No indoor plumbing in the cabin, either. I sold it in the late 1990's.
Many times over the years, we've done a lot of traveling by truck and camping, although many places we camp don't have outhouses, most of those are in public campgrounds and we try to get away from people and into nature.