لما استلم المرتب، هاحط شوية فلوس في حساب التوفير.

It is clearly Egyptian Arabic.

A few clues:

• هاحط = I’ll put. The ها- future marker is very Egyptian.
• مرتب is the everyday Egyptian word for salary/pay.
• فلوس is a very common colloquial word for money.

A more formal MSA version would be:

عندما أستلم الراتب، سأضع بعض المال في حساب التوفير.

Here لما means when or once.

It introduces a time clause:

• لما استلم المرتب = when I receive the salary / once I get paid

In Egyptian speech, لما is very common and natural. It often corresponds to more formal عندما in MSA.

In this sentence, it is understood as أستلم / astalem = I receive / I get, not past I received.

A few things are happening:

• In everyday Arabic writing, short vowels are usually not written.
• In casual Egyptian writing, people also often omit the initial أ.
• So استلم may represent spoken أستلم.

Also, after لما in a future-time clause, Egyptian often uses the bare imperfect without بـ:

• لما أستلم = when I get
• بستلم usually sounds more like a regular/habitual present: I receive / I usually get

So لما استلم المرتب is a natural Egyptian way to say when I get my salary.

Because the future meaning is already clear from لما plus the context of the sentence.

In Egyptian, after a word like لما meaning when, the first action is often understood as a future event without needing an extra future marker:

• لما أستلم المرتب = when I get paid
• هاحط... = I’ll put...

So only the main action is explicitly marked with ها- here.

هاحط is made of:

• ها- = future marker, roughly will / going to
• أحط = I put

So:

• هاحط = I will put

This is a very common Egyptian pattern:

• هاعمل = I’ll do
• هاروح = I’ll go
• هاكتب = I’ll write

Because Arabic often leaves the subject pronoun out when it is already clear.

In speech, أستلم and أحط already show I. In this sentence, the written form is informal, so أستلم appears as استلم, which hides that a bit for learners, but native speakers still understand it easily.

You can say أنا if you want emphasis:

• لما أستلم المرتب، أنا هاحط شوية فلوس...

But normally it is not necessary.

مرتب is the common Egyptian word for salary, pay, or sometimes paycheck/pay money in everyday speech.

راتب is also understood, but it sounds more formal and closer to MSA.

So:

• مرتب = more natural in Egyptian conversation
• راتب = more formal / standard

That is why المرتب fits this sentence well.

Because the speaker means a specific salary: the one they are expecting to receive.

Arabic often uses the definite article where English might use a possessive:

• المرتب can naturally mean the salary or my salary, depending on context.

So in this sentence, المرتب is understood as the speaker’s own salary/pay.

شوية فلوس means some money.

Word by word:

• شوية = a little / some / a few
• فلوس = money

Even though فلوس is historically a plural word, in modern Egyptian it often works like the mass noun money in English.

So:

• شوية فلوس = some money
• very natural, everyday Egyptian wording

In Egyptian Arabic, في is commonly used where English would say in or into.

So:

• هاحط شوية فلوس في حساب التوفير literally looks like I’ll put some money in the savings account
• but natural English translation is often into the savings account

Arabic does not always make the same in vs. into distinction that English does.

It literally means account of saving/savings.

• حساب = account
• التوفير = saving / savings

Together:

• حساب التوفير = savings account

This is a normal and widely understood way to say it.

A natural Egyptian-style pronunciation would be something like:

lammā astalem el-moratab, haḥoṭṭ šoweyyet fulūs fī ḥesāb et-tawfīr

A few notes:

• لما sounds like lammā
• استلم here is pronounced as astalem
• هاحط sounds like haḥoṭṭ
• شوية may sound like šoweyya or šwayya, depending on the speaker

Exact pronunciation varies, but that gives you a good colloquial Egyptian feel for the sentence.