Nada disso foi culpa minha.

Literally, nada means nothing, and disso means of that / of this / of it depending on context.

So nada disso is very commonly used to mean:

• none of that
• nothing of that
• nothing of it

In this sentence, it means that none of the things being talked about were the speaker’s fault.

Because disso is the form used after the idea of de.

A very useful way to think about it is:

• isso = that / this
• disso = of that / about that / from that

Portuguese often uses these combined forms:

• de + isso = disso
• de + isto = disto
• de + aquilo = daquilo

Since nada disso is a fixed and very common expression, you should learn it as a chunk meaning none of that.

Foi is the preterite form of ser (and also of ir, depending on context).

Here it comes from ser and means was:

• foi = was

So:

• Nada disso foi culpa minha = None of that was my fault

The preterite is used because the speaker is referring to something completed in the past.

Both are possible, but culpa minha is very natural in Portuguese, especially in expressions about responsibility or blame.

Compare:

• Foi culpa minha = It was my fault
• Foi minha culpa = also possible, but often a bit less idiomatic in everyday speech

Portuguese often places the possessive after the noun in set expressions like this:

• culpa minha
• ideia minha
• amigo meu
• problema seu

So culpa minha sounds very normal and native-like.

Yes, you can. It is understandable and grammatically acceptable.

But in everyday Brazilian Portuguese, Nada disso foi culpa minha is usually the more natural phrasing.

So:

• Nada disso foi culpa minha = more idiomatic/common
• Nada disso foi minha culpa = also correct, just slightly less typical in many contexts

Because Portuguese normally does not use de + object pronoun like English learners might expect here.

After many nouns, Portuguese prefers a possessive:

• culpa minha = my fault
• culpa sua = your fault
• culpa dele/dela = his/her fault

So culpa de mim sounds unnatural. Use culpa minha instead.

In this expression, Portuguese normally does not use an article.

The basic pattern is:

• Foi culpa minha
• É culpa sua
• Não foi culpa dele

Adding an article here would usually sound unnatural.

So culpa minha works as a fixed expression meaning my fault.

Yes, very common.

By itself, Nada disso! can mean things like:

• Not at all!
• No way!
• None of that!
• That’s not it!

Its exact meaning depends on context and tone.

In your sentence, though, it is simply the subject of the sentence:

• Nada disso = none of that
• foi culpa minha = was my fault

Yes. That is also very common.

The difference is mostly emphasis:

• Não foi culpa minha = It wasn’t my fault
• Nada disso foi culpa minha = None of that was my fault

The second one is more specific: it refers to a set of things already being discussed and denies responsibility for all of them.

The given word order is the most natural one:

• Nada disso foi culpa minha

It follows a simple pattern:

• subject: Nada disso
• verb: foi
• complement: culpa minha

Other word orders might be possible for emphasis, but they are less neutral. For example:

• Culpa minha não foi nada disso sounds strange in normal conversation

So for learners, the original order is the safest and most natural.

Because culpa here means fault/blame/responsibility as an abstract idea, not a countable item.

So even if many events are being discussed, Portuguese still says:

• Nada disso foi culpa minha

It is like saying none of that was my fault, not my faults.

It is neutral and very natural. You can use it in:

• everyday conversation
• arguments
• explanations
• written messages
• informal or semi-formal situations

It does not sound slangy, and it does not sound overly formal either.

A broad Brazilian-style pronunciation might sound roughly like:

• NA-da DI-so foy KUL-pa MIN-ya

A few helpful notes:

• disso sounds like DJEE-soo or JEE-soo in some accents, but not everywhere
• foi usually sounds like one syllable, roughly foy
• minha is pronounced like MEE-nya

The nh in minha is like the ny sound in canyon.

It is a possessive form meaning my.

In culpa minha, it behaves like a possessive linked to the noun culpa.

Portuguese possessives can come before or after the noun, depending on structure and style:

• minha culpa
• culpa minha

In this sentence, the post-noun position is especially natural.

Yes, very much so. Depending on tone, Nada disso foi culpa minha can sound:

• calm and explanatory
• defensive
• emphatic
• even upset

If someone is being blamed, this sentence strongly pushes back against that blame:

• None of that was my fault

So the grammar is neutral, but the tone can carry emotion depending on how it is said.