Portosan
/ˈpɔːtəsan/originally and chiefly US
noun
A small prefabricated unit containing a toilet, designed for easy transportation and temporary installation, especially outdoors, as on a work site or at an open-air public event.
- A trademark in the United States..
Origin
1960s; earliest use found in American Speech. From Porto- (alteration of porta-; compare -o-) + san-.