مفيش صابون في الحمام، فاختي هتشتري صابون من السوبرماركت.

مفيش means there isn’t / there aren’t / there is no in Egyptian Arabic.

So:

• مفيش صابون = There’s no soap

It’s a very common Egyptian colloquial word for non-existence.
In Modern Standard Arabic, you’d usually say something like لا يوجد instead.

A useful contrast:

• في صابون = there is soap
• مفيش صابون = there is no soap

In Arabic, especially in sentences like this, you often do not need a separate verb equivalent to English is/are.

So the first clause is literally something like:

• مفيش صابون في الحمام
• There-is-no soap in the bathroom

This is completely normal in Egyptian Arabic. The idea of existence is carried by في / مفيش, not by a separate verb like is.

Because صابون here means soap in general, not the soap.

So:

• صابون = soap / any soap
• الصابون = the soap

In this sentence, the meaning is general: there isn’t any soap in the bathroom, so the sister will buy some soap. That is why صابون appears without ال both times.

The فـ means so, then, or therefore.

So:

• فاختي هتشتري... = so my sister will buy...

It connects the two ideas:

1. There’s no soap in the bathroom.
2. So my sister will buy soap from the supermarket.

In Arabic, this فـ is often attached directly to the next word in writing.

In informal Egyptian writing, the hamza is often omitted, especially in everyday typed text.

So:

• أختي = more careful spelling
• اختي = very common informal spelling

Both mean my sister.

A learner should recognize both forms.

The base word is:

• أخت / اخت = sister

When you add ـي, it means my:

• اختي = my sister

This ـي ending is a very common possessive ending in Arabic.

Other examples:

• بيتي = my house
• أمي / امي = my mother
• أخويا = my brother (Egyptian form)

هتشتري means she will buy here.

It can be broken down like this:

• تشتري = she buys / she is buying
• هتشتري = she will buy

The هـ at the beginning marks the future in Egyptian Arabic.

So:

• تشتري = she buys
• هتشتري = she will buy

Because the subject is اختي (my sister), we understand تشتري as she buys, not you buy.

In Arabic verb conjugation, the form for she in the present/future often begins with تـ.

So in Egyptian Arabic:

• هي تشتري = she buys
• هي هتشتري = she will buy

This can be confusing for English speakers, because t- may look unexpected for she, but it is normal Arabic grammar.

Also, this same تـ form can sometimes also mean you (singular), but the context tells you which one is meant. Here, because of اختي, it clearly means she.

It means from the supermarket.

Breakdown:

• من = from
• السوبرماركت = the supermarket

So:

• هتشتري صابون من السوبرماركت
• She will buy soap from the supermarket

This works much like English buy something from somewhere.

Even borrowed words can take the Arabic definite article الـ.

So:

• سوبرماركت = a supermarket / supermarket
• السوبرماركت = the supermarket

This is very normal in Egyptian Arabic. Arabic treats many loanwords like regular nouns in this way.

In pronunciation, the ل of الـ is usually assimilated before sun letters, and س is one of them.

So although it is written:

• السوبرماركت

it is pronounced more like:

• es-supermarket / is-supermarket

not al-supermarket.

By contrast, in الحمام, the ل is pronounced, because ح is not a sun letter:

• الحمام → il-ḥammām

A natural transliteration would be something like:

mafīsh sābūn fil-ḥammām, fa-xti hatishtiri sābūn min is-sūbirmārkit.

You may also see slightly different transliterations, because Egyptian Arabic is not spelled with one single standard transliteration system.

A few notes:

• في الحمام often sounds like fil-ḥammām
• فاختي sounds like fa-xti
• السوبرماركت sounds like is-sūbirmārkit because of assimilation

Yes, it is clearly Egyptian Arabic.

Clues include:

• مفيش instead of لا يوجد
• هتشتري for the future
• informal spelling like اختي

A Modern Standard Arabic version would be closer to:

لا يوجد صابون في الحمام، لذا ستشتري أختي صابونًا من السوبرماركت.

So this sentence is natural everyday Egyptian, not formal Standard Arabic.

Yes. Depending on context, فـ can feel like:

• so
• then
• therefore

In this sentence, so is probably the best English match, because the second action is a result of the first situation:

• No soap in the bathroom, so my sister will buy some.

But then my sister will buy soap is not far off in meaning.