Portuguese Phrase
O que foi?
Meaning
Literally 'What was it?', this phrase is used to ask what just happened, what the cause of a sudden event was, or to request clarification about something that was just said. It carries a casual, conversational tone.
When to use
Use 'O que foi?' right after you notice something unexpected—a loud noise, a surprising comment, or a sudden change in plans. It’s common among friends, family, and even in informal workplace chats.
✦Grammar Breakdown
Oquefoi?
Definite article O
The masculine singular article 'o' introduces a noun or pronoun; here it works with the interrogative pronoun 'que' to form a question.
Interrogative pronoun que
'Que' means 'what' and can stand alone or introduce a clause; in this phrase it asks for information about an event.
Past of ser/ir – foi
'Foi' is the third‑person singular preterite of both 'ser' (to be) and 'ir' (to go). In questions like this it functions like the English 'happened' or 'was'.
Ellipsis of the subject
The subject is omitted because it is understood from context; the phrase literally translates to 'What (it) was?'
🗨In Conversation
Escutou aquele barulho? O que foi?
Did you hear that noise? What was it?
Acho que foi o caminhão passando na rua.
I think it was a truck passing by.
✕Common Mistakes
O que ele foi?
Do not add a subject pronoun (e.g., *'O que ele foi?'*). The verb already implies the subject.
O que é?
Avoid using the present tense 'é' here; 'O que é?' asks for identity, not for an event that just occurred.
Qual foi?
Do not replace 'que' with 'qual' unless you are asking about a specific choice (e.g., 'Qual foi?').
↔Alternatives
O que aconteceu?
What happened?
O que rolou?
What went down?
O que se passou?
What went on?
Cultural Tip
In Brazil, 'O que foi?' is informal and best reserved for people you know well. In more formal settings you’d ask 'O que aconteceu?' or 'Pode me explicar o que ocorreu?'. In some regions of Portugal speakers may prefer 'Que se passou?' instead of the Brazilian‑style 'O que foi?'.