little boys' room

Etymology
Originally from the need to find public lavatories for children, but subsequently used more broadly.

Noun

 * : a public lavatory intended for use by men.
 * Excuse me, where is the little boys' room? My son is about to burst a bladder.
 * 1) A room belonging to or used by little boys, particularly their bedroom.
 * 1) A room belonging to or used by little boys, particularly their bedroom.
 * 1) A room belonging to or used by little boys, particularly their bedroom.

Synonyms

 * See Thesaurus:bathroom