little boys' room

Right now Al's chair was vacant, he having excused himself to go to the little boys' room.

I mean that we had better hurry along to the little boys' room, Jonesy said.

Got to visit the little boys' room!"

It started with me just barely keeping the Head Selectman and one of my deputies from beating each other to a bloody pulp in the little boys' room."

René is standing in the corridor and after buying some time, by telling Edith that he needs to go to "the little boys' room", he goes to find somewhere to hide.