WordWeb Online

1. Used as a greeting
   - aloha [US, informal], g'day [Austral, informal], greetings, hi [informal], hello, hiya [informal], hallo, hullo, howdy [informal], howzit [S.Africa, informal], gidday [NZ, informal], yo [informal], wotcha [Brit, informal], wotcher [Brit, informal]
    
2. Used to get someone's attention
   - oy [informal], oi [informal], excuse me

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Encyclopedia: Hey, Mr Producer!