في بقعة عالقميص.

A simple breakdown is:

• في = there is / there are here
• بقعة = a spot / stain / mark
• عالقميص = on the shirt

So the structure is basically there is + a stain + on the shirt.

Not in this sentence. In Levantine, في very often has an existential meaning: there is / there are.

For example:

• في مشكلة = There is a problem
• في ناس هون = There are people here

So in في بقعة عالقميص, في is not the preposition in. It is introducing the existence of something.

Because this is colloquial Levantine.

In everyday speech, على is very often shortened to عَ. When that comes before الـ, it commonly becomes عالـ in pronunciation and in casual writing.

So:

• على القميص → عَ القميص → عالقميص

All of these point to the same idea: on the shirt. The spelling of dialect is not fully standardized, so you may see different written versions.

A common pronunciation would be something like:

fii boʔʿa ʿal-ʔamiiṣ

Depending on the region, you may also hear something closer to:

fii buqʿa ʿal-qamiiṣ

A few helpful notes:

• بقعة is often pronounced boʔʿa in urban Levantine
• قميص may sound like ʔamiiṣ in dialects where ق becomes a glottal stop
• In some accents, ق stays q, so you hear qamiiṣ
• The ع in عالـ is the consonant ʿayn, a throat sound that English does not have

Arabic usually does not have a separate word for a/an. So a bare noun like بقعة naturally means a stain / a spot.

But القميص has الـ, so it means the shirt. That tells you the speaker has a specific shirt in mind.

So the contrast is normal:

• بقعة = a stain
• القميص = the shirt

Because Arabic normally leaves out the present-tense verb to be.

In English you say There is a stain on the shirt.
In Levantine, the idea is expressed without a separate word for is.

The pattern here is very common:

• في + indefinite noun + place

So في بقعة عالقميص is a normal spoken-Arabic way to say that something exists somewhere.

This is the neutral, everyday existential pattern in Levantine:

• في
  • the thing that exists + where it is

So the sentence first introduces a stain, then tells you its location.

You could change the order for emphasis, but the meaning focus would shift. For example:

• عالقميص في بقعة = On the shirt, there’s a stain

That sounds more marked or emphatic. The given sentence is the more straightforward version.

It is clearly colloquial Levantine.

The strongest clue is عالقميص, which reflects spoken contraction. In Standard Arabic, you would more likely see something like:

• هناك بقعة على القميص
• توجد بقعة على القميص

So if you are learning Levantine conversation, في بقعة عالقميص is the kind of wording you really might hear.

Yes. A very common alternative is:

• القميص عليه بقعة

Literally, that is something like the shirt, on it, a stain, and it is very natural in spoken Levantine.

You might also see or hear:

• في بقعة على القميص

This is a little less dialect-looking in writing, but still easy and natural. The version with عالقميص just sounds more clearly colloquial.