is a word we can use in formal and informal contexts.
We often say this word to greet or praise members of the Church or Monarchy.
Salve, César! = Hail
, Cesar! (example of greeting
Ave Maria! = Hail
(Holy) Mary! (example of praise
Salve Jorge! = Hail
Deus salve a rainha = God save
The word "hail
" was originated in Europe between 1150 and 1200.
However, in informal contexts, we can use the word "Salve" to enphasize how much we respect someone. Sometimes, it maybe sounds ironically.
I should recommend you use the following terms:Hello / Hi
If you ask for a group to give an ovation, to cheer up for someone, you should say:
Uma salva / Um urra para nosso amigo = Hooray
(for our friend).
Eu quero mandar um "oi" / um "salve" para todos os nossos amigos = I want to give a "shout out" to all my friends...
Hi / Hello / Hooray are interjections.
(To) shout out is phrasal verb and a slang.
I hope I have helped.
I believe this article might be interesting for you:https://www.englishexperts.com.br/giria-shout-out/
(1) Longman Dicitionary. Pearson Education.
(2) Michaelis: Dicionário de Gírias (Inglês – Português). Mark G. Nash, Willians Ramos Ferreira. São Paulo: Editora Melhoramentos, 2008.