اختي معاها شنطة سودا كبيرة.

It means my sister.

A few useful points:

• In more careful spelling, you will often see أختي.
• In casual typing, especially in dialect writing, people often drop the hamza and write اختي.
• The ending -ي means my.

So:

• أخت / اخت = sister
• أختي / اختي = my sister

In Egyptian Arabic, it is commonly pronounced roughly okhti.

معاها means with her.

It is made of:

• مع = with
• ها = her

In Arabic, prepositions commonly attach directly to pronoun endings, so they are written together:

• معايا = with me
• معاك = with you (masc.)
• معاها = with her
• معاه = with him

So معاها is not a random single word you just memorize whole; it is a preposition plus a pronoun suffix.

In Arabic, there is no everyday present-tense verb that works exactly like English have in all situations.

Instead, possession is often expressed with something like:

• مع
  • pronoun = literally with
• عند
  • pronoun = literally at / by

So this sentence is literally close to:

• My sister, with her, a big black bag

But in natural English, that becomes:

• My sister has a big black bag

This is a very normal Arabic way to express possession.

شنطة means bag.

Yes, it is treated as feminine, which is important because the adjectives after it must also be feminine.

The ending ة is often a clue that a noun is feminine, though not every noun follows that pattern.

So here:

• شنطة = bag
• feminine noun

That is why the following adjectives are feminine too.

Because in Arabic, adjectives usually come after the noun they describe.

So instead of English:

• a big black bag

Arabic says something more like:

• a bag black big

That is normal Arabic word order.

Also, when you have more than one adjective, they all come after the noun:

• شنطة = bag
• سودا = black
• كبيرة = big

So:

• شنطة سودا كبيرة = a black big bag literally, meaning a big black bag

The order between adjectives can be somewhat flexible in real speech, but the important rule for learners is:

• noun first
• adjectives after it

Because they describe شنطة, and شنطة is feminine.

In Arabic, adjectives agree with the noun they describe in gender and number.

So here:

• شنطة = feminine singular
• سودا = black, feminine singular
• كبيرة = big, feminine singular

If the noun were masculine, the adjective forms would change.

For example:

• شنطة كبيرة = a big bag
• شنط كبيرة = big bags

Agreement is a major feature of Arabic grammar, so this is a very important pattern to notice.

Because this sentence is in Egyptian Arabic, not Modern Standard Arabic.

In Modern Standard Arabic, the feminine form is:

• سوداء

In Egyptian Arabic, the everyday form is:

• سودا

This kind of shortening is very common in dialect. Compare:

• حمرا = red (feminine, Egyptian)
• بيضا = white (feminine, Egyptian)
• خضرا = green (feminine, Egyptian)
• سودا = black (feminine, Egyptian)

So سودا is the normal Egyptian colloquial form.

Because the phrase is indefinite: it means a big black bag, not the big black bag.

In Arabic:

• no ال = usually a/an in English
• ال = the

So:

• شنطة سودا كبيرة = a big black bag
• الشنطة السودة الكبيرة = the big black bag

Notice that when the noun is definite with ال, the adjectives also normally become definite with ال.

Yes. That is also natural Egyptian Arabic.

Both معاها and عندها can express possession.

Very roughly:

• معاها can suggest she has it with her / in her possession
• عندها is extremely common for she has

In many everyday situations, both are acceptable and natural.

So these are both fine:

• أختي معاها شنطة سودا كبيرة
• أختي عندها شنطة سودة كبيرة

You may hear slightly different spellings like سودا and سودة in informal writing, depending on the writer.

Yes, you may hear different adjective orders in real speech.

The key rule is still:

• noun first
• adjectives after the noun

So both of these are understandable:

• شنطة سودا كبيرة
• شنطة كبيرة سودا

The difference is usually about style, emphasis, or what sounds more natural to a particular speaker.

For a learner, the most important thing is not to copy English word order. Do not put the adjectives before the noun.

A helpful rough pronunciation is:

okhti ma‘aha shanta sōda kibīra

A few notes:

• اختي / أختي → okhti
  • خ is like the ch in Scottish loch or German Bach
• معاها → ma‘aha
  • ع has no exact English equivalent; learners often start with a light pause or a deep throat sound
• شنطة → shanta
• سودا → soda / sōda
• كبيرة → kibeera

So the whole sentence is approximately:

okhti ma‘aha shanta sōda kibeera