الدكتورة بصت في بقي.

A common Cairene pronunciation is ed-doktora baṣṣet fi boʔʔi.

A few useful notes:

• الدكتورة → ed-doktora. The l of الـ assimilates to the د, so you hear a doubled d.
• بصت is pronounced baṣṣet, with a doubled ṣ sound, even though the shadda is often not typed in everyday writing.
• في is fi or fī.
• بقي here is pronounced something like boʔʔi or buʔʔi. In Cairene Egyptian, ق is often pronounced as a glottal stop.

Because the doctor in this sentence is female.

• دكتور = male doctor
• دكتورة = female doctor

The ending ـة is a very common feminine ending in Arabic. So الدكتورة means the female doctor.

That -ت marks the past tense for she.

The verb is بصّ = to look in Egyptian Arabic. In the past tense:

• هو بصّ = he looked
• هي بصّت = she looked

Since الدكتورة is feminine singular, the verb has to match it, so you get بصت.

In Egyptian Arabic, بصّ في is a very common expression meaning look at or look into, depending on the context.

So the في is not random. It is part of the usual pattern with this verb.

This is a good example of how prepositions do not match English one-for-one:

• English might say look at
• or look in / look into
• Egyptian Arabic often uses بصّ في

Here بقي means my mouth.

It comes from:

• بُقّ = mouth
• -ي = my

So:

• بُقّي = my mouth

This is a colloquial Egyptian word. A learner who knows Modern Standard Arabic might expect فمي, but in Egyptian speech بُقّ is very common.

Because Arabic usually adds possessive pronouns directly onto the noun as suffixes.

So instead of saying a separate word for my, Egyptian Arabic attaches -ي to the noun:

• بُقّ = mouth
• بُقّي = my mouth

The same idea works with other possessive endings too:

• بُقّك = your mouth
• بُقّه = his mouth
• بُقّها = her mouth

Because everyday Arabic writing usually leaves out short vowels, and in informal writing people also often skip other helpful marks.

So a more learner-friendly spelling might be:

• بُقّي
• بصّت

But in normal typing, people often write:

• بقي
• بصت

That means you have to rely on context. In this sentence, بقي is understood as my mouth, not some other word with the same bare consonant pattern.

Yes. الدكتورة بصت في بقي is a very natural spoken Egyptian sentence.

Egyptian Arabic often likes subject + verb + rest of sentence, especially when the subject is definite, like الدكتورة.

You may also hear other word orders in different contexts, but this one is completely normal and common.

This sentence is clearly Egyptian Arabic.

Clues include:

• بصّ for look
• بُقّ for mouth
• the spoken-style pronunciation and spelling
• no case endings

In Modern Standard Arabic, you would usually say something different, such as:

• نظرت الطبيبة إلى فمي
• or, depending on the situation, فحصت الطبيبة فمي

So this sentence is great for Egyptian Arabic, but it is not standard formal Arabic.