(noun - informal) (especially in hip-hop or dance music) a mention, credit, or greeting, typically one made over the radio or during a live performance
(noun) A mentioning of a person verbally or in writing, as a method of showing respect. Often heard used on the radio by DJ's replacing the previously popular request. [1990s]
To provide information you weren't asked for, particularly in a school environment
My teacher said I shouldn't shout out all the time.
If you shout something out, you say it very loudly so that people can hear you clearly. They shouted out the names of those detained I shouted out `I'm OK' I wanted to shout it out, let her know what I had overheard