portable toilet; temporary toilet
Refers to a movable, self-contained toilet unit used temporarily at construction sites, outdoor events, or disaster areas. The term 仮設トイレ is a common synonym.
See also: 仮設トイレ
A portable toilet is set up at the construction site.
野外フェスでは仮設便所の数が足りなかった。
There weren't enough portable toilets at the outdoor festival.
Compound of 仮設 (temporary, provisional) and 便所 (toilet, lavatory). The reading is straightforward on'yomi.