Hi, A 'cue' in the theatre is a stage signal. Thus, 'to cue someone' means to give them a stage signal, eg to make an entrance. That's why we say 'Cue Johnny'.
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ArvsworldThe word "queue" in his case may have meant: If you want Johnny to answer your question, get in line. He is very busy and has a lot of messages to respond to.(Wouldn't that have been "queue for Johnny"? As it stands, if "queue" does mean "queue", it would seem to imply that Johnny himself should queue.)