Det er en pussig historie.

Det er is a very common Norwegian pattern meaning it is or sometimes there is/there are, depending on context.

In this sentence, det is a kind of dummy subject: Norwegian usually wants a subject in the sentence, even when English might be less explicit. So Det er en pussig historie is a natural way to say It is a strange/odd/funny story.

You should not always translate det literally as it word-for-word; sometimes it is just there because Norwegian grammar expects it.

En is the indefinite article, like a or an in English.

So:

• en historie = a story
• historien = the story

Because historie is a singular countable noun, Norwegian normally uses an article when you mean a story.

Yes. In Bokmål, historie is a noun that can often be treated as either:

• common/masculine style: en historie, historien
• feminine style: ei historie, historia

So en pussig historie is completely correct, and ei pussig historie is also possible in Bokmål, depending on the writer’s or speaker’s style.

A learner will often see en historie very frequently, so this sentence is perfectly normal.

Because it comes before an indefinite singular noun here.

The basic pattern is:

• en pussig historie = indefinite singular
• den pussige historien = definite singular
• pussige historier = plural

So in this sentence, pussig is in its basic form.

A useful extra note: adjectives ending in -ig often do not change in the neuter singular either, so you also get things like et pussig spørsmål.

Pussig usually means something like:

• odd
• peculiar
• curious
• sometimes funny in the sense of quirky or amusing

It does not necessarily mean funny in the strong haha, hilarious sense. It often suggests that something is a little unusual, surprising, or strangely amusing.

So en pussig historie is often better understood as:

• a peculiar story
• a curious story
• an odd story

depending on context.

Because in Norwegian, the normal order inside this kind of noun phrase is:

article + adjective + noun

So:

• en stor bil = a big car
• et gammelt hus = an old house
• en pussig historie = a peculiar story

This is similar to English word order, so it is usually not too hard for English speakers to recognize.

Yes, but it means something slightly different.

• Det er en pussig historie = It is a peculiar story / introducing or describing it
• Historien er pussig = The story is peculiar / talking about a specific story

So the version with det er sounds more like a general introduction or presentation, while Historien er pussig refers to the story more directly.

Yes, but the focus changes.

• Det er en pussig historie = a more neutral statement, It is a peculiar story
• Dette er en pussig historie = This is a peculiar story, where you are pointing to or introducing something specific

So if you are holding a book, telling someone about a particular event, or drawing attention to something concrete, Dette er ... can be a better choice.

Depending on context, natural English versions could be:

• It’s a strange story.
• It’s an odd story.
• It’s a curious story.
• It’s a funny little story.

The best choice depends on what kind of pussig the speaker means: unusual, slightly amusing, or both.