A public toilet or lavatory available for general public use; also called 'public restroom.'
公園の公衆便所は朝に清掃されることが多い。
The public toilets in the park are often cleaned in the morning.
旅行中に公衆便所を探して、駅前で見つけた。
While traveling I looked for a public toilet and found one in front of the station.
入口に『公衆便所』と大きく表示されている。
The entrance is marked with a large sign reading 'public toilet.'
A vulgar, derogatory slang term used to insult someone (very offensive). It should be avoided in ordinary speech.
彼女を「公衆便所」などと罵るのは非常に侮辱的だ。
Calling her a 'public toilet' is extremely insulting.