بكرة عندنا اجتماع مهم مع المدير في المكتب.

It is natural Egyptian Arabic.

A very close Modern Standard Arabic version would be:

غدًا لدينا اجتماع مهم مع المدير في المكتب.

What makes your sentence feel Egyptian is especially بكرة for tomorrow. The rest of the sentence uses words that are also understandable in Standard Arabic, but the overall phrasing is very natural in everyday Egyptian speech.

بكرة means tomorrow in Egyptian Arabic.

A common pronunciation is bokra or bukra. You will hear small vowel differences depending on the speaker.

This is one of the most common everyday words for tomorrow in Egypt. A learner should definitely know it.

Arabic often puts time expressions early in the sentence.

So بكرة عندنا اجتماع مهم... is very natural, like saying in English:

Tomorrow, we have an important meeting...

Starting with the time word helps set the scene first. It does not sound unusual at all.

عندنا is made of:

• عند = at / with
• نا = us / our

So literally it means something like with us or at us.

But in everyday Arabic, عندنا is very commonly used to mean we have.

So:

عندنا اجتماع = we have a meeting

Because Arabic usually does not use a verb like English have in this kind of present-tense sentence.

Instead, it uses a structure like:

عند + person

So:

• عندي = I have
• عندك = you have
• عندنا = we have

That is why عندنا اجتماع literally looks like at us [there is] a meeting, but it naturally means we have a meeting.

In Egyptian Arabic, اجتماع is commonly pronounced something like egtemaʿ.

Two useful points:

• The letter ج in Egyptian Arabic is usually pronounced like g in go
• The final ع is a deep Arabic consonant; beginners often approximate it, and that is normal at first

So a learner-friendly pronunciation is:

eg-te-MAʿ

Because in Arabic, adjectives usually come after the noun.

So:

• اجتماع مهم = an important meeting

This is the normal order in Arabic, unlike English.

Also, the adjective must match the noun in things like:

• gender
• number
• definiteness

Here, اجتماع is masculine singular, so مهم is also masculine singular.

Because Arabic adjective order and agreement work differently from English.

The correct pattern is:

noun + adjective

So:

• اجتماع مهم = an important meeting
• الاجتماع المهم = the important meeting

In your sentence, the meeting is indefinite, so both words stay indefinite:

• اجتماع = a meeting
• مهم = important

If it were definite, both would become definite:

• الاجتماع المهم

مع means with.

So:

مع المدير = with the manager / with the director / with the boss

The word المدير has الـ, so it is definite: the manager.

This sounds natural because in many situations both speaker and listener already know which manager is meant. Arabic often uses the definite article with familiar roles like:

• المدرس = the teacher
• الدكتور = the doctor
• المدير = the manager

في المكتب means in the office or sometimes at the office, depending on context.

In careful speech:

• في = in
• المكتب = the office

In natural connected speech, people often say it more like:

fil-maktab

That happens because في + الـ gets smoothed together in pronunciation.

Yes, Arabic word order is fairly flexible.

For example, these can all work:

• بكرة عندنا اجتماع مهم مع المدير في المكتب
• عندنا بكرة اجتماع مهم مع المدير في المكتب
• عندنا اجتماع مهم بكرة مع المدير في المكتب

They all mean roughly the same thing, though the focus changes a little.

Your original version is very natural because it starts with بكرة, which highlights the time first.

A learner-friendly pronunciation would be:

Bokra ʿandena egtemaʿ mohem maʿa l-modeer fel-maktab.

You may also hear slightly different vowel choices, such as:

Bukra ʿandina egtemaʿ mohemm maʿ el-modeer fil-maktab.

These differences are normal. The important thing is recognizing the main Egyptian pronunciations:

• بكرة → bokra / bukra
• عندنا → ʿandena / ʿandina
• اجتماع → egtemaʿ
• مهم → mohem / mohemm
• في المكتب → fel-maktab / fil-maktab