Real Dictionary

locker room
countable noun: A locker room is a room in which there are a lot of lockers.

locker room in American English
a room equipped with lockers, as at a gymnasium, swimming pool, factory, etc., for storing one's clothes and equipment
noun: a room containing lockers, as in a gymnasium, factory, or school, for changing clothes and for the storage and safekeeping of personal belongings

locker room in British English
noun: a room in a swimming pool, factory, or gym where there are lockers

locker-room in American English
adjective: of, characteristic of, or suitable to conversation in a locker room; earthy or sexually explicit

locker-room in British English
adjective: (of behaviour, esp humour) typical of that found in a male changing room; crude