الحمام نضيف دلوقتي بعد ما اختي نضفته.

Yes, الحمام can mean either the bathroom or the pigeons, depending on context.

Here, the context makes bathroom the only natural meaning:

• نضيف دلوقتي = clean now
• بعد ما اختي نضفته = after my sister cleaned it

That fits bathroom, not pigeons.

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

So:

• الحمام نضيف literally looks like the bathroom clean
• but it means the bathroom is clean

This is completely normal in Egyptian Arabic and in Arabic generally for present-time sentences.

If you wanted a past meaning, you would use a verb such as كان:

• الحمام كان نضيف = the bathroom was clean

This is a very important difference.

• الحمام نضيف = The bathroom is clean
• الحمام النضيف = the clean bathroom

In your sentence, نضيف is the predicate of the sentence, not just an adjective inside a noun phrase. That is why it does not take الـ here.

So the pattern is:

• definite noun + predicate = the bathroom is clean

not

• noun + adjective = the clean bathroom

Basically, yes.

In Standard Arabic, the common word is نظيف. In Egyptian Arabic, you will very often hear and see نضيف with the same meaning: clean.

So for learners, it is useful to think:

• نظيف = more Standard
• نضيف = very common in Egyptian speech

دلوقتي means now, right now, or at the moment.

So:

• الحمام نضيف دلوقتي = The bathroom is clean now

It is one of the most common Egyptian Arabic time words.

Yes, Egyptian Arabic has some flexibility with adverbs like دلوقتي.

This sentence puts it after نضيف:

• الحمام نضيف دلوقتي

That sounds natural and means the bathroom is clean now.

But you may also hear other orders, depending on emphasis, such as:

• دلوقتي الحمام نضيف
• الحمام دلوقتي نضيف

The version in your sentence is a normal, natural choice.

Together, بعد ما means after when it is followed by a whole clause.

So:

• بعد ما اختي نضفته = after my sister cleaned it

Here, ما is just part of the connector. It does not literally mean what in this sentence.

This is a very common Egyptian structure:

• بعد ما
  • clause = after
    • clause

The base word is:

• أخت = sister

Then Arabic adds the suffix -ي to mean my:

• أختي = my sister

In everyday writing, especially in dialect, the initial hamza is often not written, so you will very often see:

• اختي

instead of

• أختي

They mean the same thing.

It comes from the verb نضّف, which means to clean.

In نضفته:

• the verb means cleaned
• the ending -ه means it or him

So نضفته means cleaned it.

In this sentence, it refers back to الحمام.

One thing that can confuse learners is that normal Arabic spelling does not show short vowels, so colloquial verb forms can look less clear on the page than they sound in speech.

Because الحمام is grammatically masculine.

So when Arabic says cleaned it, the it is expressed with the masculine object pronoun -ه.

That is why you get:

• نضفته = cleaned it
• where it refers to الحمام

Because Arabic does not need a separate subject pronoun if the subject is already stated.

Here, the subject is already present:

• اختي نضفته = my sister cleaned it

So there is no need to add هي.

A separate هي would usually add emphasis or contrast, not just basic grammar.

Yes, it is clearly Egyptian Arabic.

Some clues are:

• دلوقتي for now
• نضيف instead of the more Standard نظيف
• the overall colloquial style

A more Standard Arabic version would be closer to:

• الحمّام نظيف الآن بعد أن نظفته أختي

So your sentence is a natural Egyptian Arabic sentence, not a formal Standard Arabic one.