Dear G,LBC
Are you thinking of a naughty [bg] varient of "Oh Dear, What Can the Matter Be"?
It starts, "Oh dear, what can the matter be, seven old ladies locked in a lavatory, they were there from Sunday to Saturday, nobody knew they were there."
The song then describes each old lady. As I have not heard nor sung this ditty in more than 40 years, I cannot remember the rest of it...but, for sure, somebody will, here.