Pronunciation: (kôl'boi"),[key] —n. 1. a boy or man who summons actors, as from their dressing rooms, shortly before they are due to go on stage.
2. a bellhop.
3. Also,call' boy".a male prostitute who arranges appointments with clients by telephone.
4. Also,call'-boy",call' boy".Railroads Slang.a railroad employee responsible for ensuring that members of a train crew are on hand for their regular runs and for notifying them of an extra run.