O prazer foi meu.

Literally, it is:

• O prazer = the pleasure
• foi = was
• meu = mine / my

A very literal English version would be The pleasure was mine.

In Portuguese, meu is standing in for meu prazer. So the full idea is something like The pleasure was my pleasure, but Portuguese naturally leaves the repeated noun out.

Foi is the past tense of ser (to be), so it means was.

That makes sense because this expression is usually said after an interaction, meeting, conversation, meal, etc. You are referring to the pleasure as something that has just happened.

Compare:

• O prazer é meu = The pleasure is mine
  More immediate, also very common.
• O prazer foi meu = The pleasure was mine
  Looking back on the interaction that just happened.

In real Brazilian Portuguese, both are used, and both sound natural.

Because meu agrees with prazer, and prazer is a masculine noun in Portuguese.

• o prazer
• meu prazer
• therefore: O prazer foi meu

This does not depend on the speaker's gender. Even if a woman says it, she still says meu, because the word it refers to is prazer, not the person speaking.

O is the masculine singular definite article, meaning the.

So:

• o prazer = the pleasure

In this expression, the article is normally included. Prazer foi meu would sound incomplete or unnatural in standard usage.

It is used as a polite response after:

• meeting someone
• being introduced
• finishing a pleasant conversation
• thanking someone for their time or company
• ending a social or professional interaction

Typical situations:

• Someone says it was nice meeting you.
• Someone thanks you for coming.
• Someone says Prazer em conhecê-lo / conhecê-la or something similar.
• You want to politely say that you also enjoyed the interaction.

It is basically a courteous, friendly closing expression.

It is generally neutral to polite.

It works well in:

• professional contexts
• semi-formal conversations
• polite social situations

It is not stiff or overly formal, but it is more polished than very casual alternatives.

If you want something a little warmer or more emphatic, Brazilians also say:

• O prazer é todo meu = The pleasure is all mine
• Eu que agradeço = I’m the one who should be thanking you

Yes. O prazer é meu is extremely common and very natural.

The difference is mostly one of perspective:

• O prazer é meu = you are presenting it as true right now
• O prazer foi meu = you are referring back to the interaction that just happened

In many real situations, the difference is small, and either one can work.

A simple approximate pronunciation for an English speaker is:

oo prah-ZEHR foy MEH-oo

A few notes:

• prazer has stress on the last syllable: pra-ZER
• foi sounds roughly like foy
• meu is often pronounced like meh-oo, but in fast speech it can sound more compressed

If spoken naturally in Brazil, the sentence flows smoothly, and the final r in prazer is softer than an English r.

Yes, absolutely.

This is a very common learner question because meu looks masculine, but here it agrees with prazer, which is masculine. So both men and women say:

• O prazer foi meu

A woman would not switch it to minha in this expression.

Because Portuguese often leaves out a repeated noun when it is obvious from context.

Here, meu really means meu prazer, but repeating prazer would sound unnecessary.

So:

• O prazer foi meu
  instead of
• O prazer foi meu prazer

This kind of omission is very normal in Portuguese.

No, they are related but used differently.

• Muito prazer is usually used when meeting someone, like Nice to meet you
• O prazer foi meu is usually a response meaning The pleasure was mine

So a possible exchange could be:

• Muito prazer.
• O prazer foi meu.

They are not interchangeable in every situation.

Yes. Some very common ones are:

• O prazer é meu. = The pleasure is mine
• O prazer foi todo meu. = The pleasure was entirely mine
• O prazer é todo meu. = The pleasure is entirely mine
• Eu que agradeço. = I’m the one who should thank you
• Imagina, o prazer foi meu. = Not at all, the pleasure was mine

These can sound a little warmer or more natural depending on the context.

No, the sentence itself stays the same.

You do not need to change it for:

• você
• senhor
• senhora
• vocês

That makes it convenient: O prazer foi meu works as a polite response regardless of the other person.

Only the wider conversation might change in formality, but this expression itself does not need to be adjusted.