Interjections are words with an emotive function. They are used to express emotions, sensations, and moods. They can be just simple vowel sounds, like «Ah!» and «Oh!», but most are either a free word or a phrase, in which case, we call them locuções interjetivas.
The same interjeição can have different meanings depending on the context in which it appears, its purpose, and the speaker’s attitude. Even with simple vowel sounds, sometimes changing the tone and extending the sound will give it another meaning.
Ai! Bati com o joelho na mesa.Ah! I hit the table with my knee.
Ai! Já me estou a passar contigo.Ah! You're getting on my nerves.
Interjections can be used as a standalone reply / affirmation or they can be followed by a sentence.
Basta! Enough!
Irra! Vocês não conseguem mesmo estar calados, pois não?Geez! You really can't keep quiet, can you?
There’s practically an unlimited number of interjeições, but below you will find the most common grouped by meaning/context.

  • Happy / ComplimentsBoa! (Nice!), Bem bom! (Very good!), Espetacular! (Spectacular!), Sim senhor! (Well done!), Maravilha! (Wonderful!), Que bom! (That’s great!), Ainda bem! (I’m glad!), Muito bem! (Well done!), Adoro! (I love it!), Iupi! (Yippee!);
  • CheeringVamos! (Let’s go!), Força! (Go for it!/Stay strong!), Vai! (Go!), Bora! (Go!), Siga! (Go!), Coragem! (Courage!), Anda! (Come!), Boa! (Nice!), Bem! (Good!), Apoiado! (I support you!), Bravo!, Parabéns! (Congratulations!), Continua! (Go on!), Dá-lhe!;
  • Desires / WishesTomara! (Hope so!), Oxalá! (Hopefully!), Quem me dera! (I wish!), Deus queira!, Se Deus quiser! (God willing!), Espero bem!, Espero que sim! (I hope so!);
  • SurprisedAh!, Ih!, Elá!, Ui!, Ena!, Eish!, Caramba!, Não pode! (It can’t be!), Não posso! (I can’t!), Não acredito! (I don’t believe it!), Ai o quê! (What!), Macacos me mordam! (I’ll be damned);
  • Impatience / FrustrationAi!, Oh!, Epá!, Opá!, Mau!, Irra! (Geez!) Bolas! (Geez!), Poxa! (Gosh!), Sinceramente! (Honestly!), Francamente! (Frankly!), Enfim! (Finally! / Anyway!);
  • AngerAgh!, Porra! (Damn!), Chiça! (Geez!), Irra! (Geez!), Raios partam! (Damn it!), Mau!;
  • CommandShiu!, Caluda! (Shut up!), Silêncio! (Silence!), Chega!, Basta! (Enough!), Acabou! (It’s over!), Parou! (Stop it!), Alto! (Hold it!), Fora! (Out!), Rua! (Out!), Chô! (Shoo!);
  • CallingÓ!, Ei!, Psiu!, Psst!, Olha! (Look!), Ajuda! (Help!), Socorro! (Help!);
  • AgreeingClaro! (Of course!), Certo! (Right!), Perfeito! (Perfect!), Sem dúvida! (No doubt!), Ora! (Well!), Isso mesmo! (That’s right!), Sim! (Yes!);
  • ApologizingUps! (Oops!), Desculpa! (Sorry!), Foi sem querer! (It was an accident!), Perdão! (Forgive me!);
  • Greetings / Saying goodbyeOlá! (Hi!), Boas! (Hello!), Viva! (Howdy!), Tchau/Xau! (Bye!), Adeus! (Goodbye!), Boa noite! (Goodnight!), Até amanhã! (See you tomorrow!), Até sempre! (So long!);
  • Horror / FearAi! (Ouch!), Credo!, Céus! (Heavens!), Meu Deus! (My God!), Jesus!, Que medo!, Que horror! (I’m scared!);
  • ReliefUfa!, Graças a Deus! (Thank God!), Aleluia!, Finalmente!, Até que enfim! (Finally!);
  • Doubt / QuestionHã!?, Huh!?, Quê!? (What!?), Como assim!? (How come!?), Hein!?;
  • WarningAlerta! (Warning!), Cuidado! (Careful!), Atenção! (Attention!), Toma atenção! (Pay attention!), Olha! (Look!);
  • Pain / SadnessAi!, Ah!, Au! (Ouch!), Oh!, Coitado de mim! (Poor me!), Que dor! (Such pain!);

Many of the expressions shown above can be combined with each other, often following the simple vowel sounds + a free word structure.

Ai, credo!Oh God!, Oh, desculpa!Oh, I'm sorry!, Epá, porra!Goddamnit!

Another way to use interjeições is to combine them with other words such as adverbs and pronouns.

Força nisso!Have at it!, Alto ! Hold it right there!

Also, you may have noticed that some expressions already have pronouns, like “Quem me dera!” for example. You can change the pronoun to “te” or “nos” and have the interjection reference other people.

Raios te partam!God damn you!

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