تخانة المج كويسة.

A good rough pronunciation is:

tekhānet el-magg kwayyisa

A few useful notes:

• تخانة is often heard as tekhāna
• In تخانة المج, the final ة is pronounced as -et because another noun follows it
• المج is pronounced el-magg in Egyptian
• Egyptian ج is usually a hard g, not an English j
• كويسة is pronounced kwayyisa or kuwayyisa

Word by word:

• تخانة = thickness
• المج = the mug
• كويسة = good

So the sentence literally means something like:

The thickness of the mug is good.

Because Arabic often leaves out the verb to be in the present tense.

So in Egyptian Arabic, a sentence like:

• تخانة المج كويسة

naturally means:

• The mug’s thickness is good

This is called a nominal sentence. In the present tense, Arabic usually does not say a separate word for is.

Because كويسة agrees with تخانة, and تخانة is a feminine noun.

That is the key point: the adjective is describing the thickness, not the mug.

So:

• تخانة = feminine
• therefore كويسة = feminine

If the main noun were masculine, you would usually use كويس instead.

This happens because تخانة المج is an iḍāfa construction, meaning a phrase like:

• the thickness of the mug
• the mug’s thickness

In Arabic, when a noun ending in ة is followed directly by another noun in this kind of construction, that ending is pronounced as t.

So:

• تخانة by itself: tekhāna
• تخانة المج: tekhānet el-magg

It is an iḍāfa construction, often called a possessive or of-phrase.

So:

• تخانة المج = the thickness of the mug
• literally: thickness the-mug

In Arabic, this structure is very common for showing possession or relationship between two nouns.

Other examples of the same pattern would be:

• باب البيت = the door of the house
• لون العربية = the color of the car

Because in an iḍāfa construction, the first noun usually does not take ال.

So Arabic says:

• تخانة المج

not:

• التخانة المج

The whole phrase becomes definite because the second noun is definite.

So تخانة المج already means the thickness of the mug, not just a thickness of a mug.

Yes. مج is a common borrowed word in Egyptian Arabic, especially in everyday speech.

A few notes:

• It comes from English mug
• In Egyptian pronunciation, it is usually said with a hard g
• So it sounds closer to magg than to an English-style muj

Loanwords like this are very common in Egyptian Arabic, especially for everyday objects.

Sometimes yes, but the nuance changes a little.

• تخانة is very common in Egyptian speech for thickness
• سمك can also mean thickness, but it may sound more neutral or more formal depending on context

Also, the agreement would change because سمك is masculine:

• سمك المج كويس

whereas with تخانة you get:

• تخانة المج كويسة

So both grammar and adjective agreement can change.

Yes, it sounds Egyptian / colloquial.

Clues include:

• كويسة instead of a more formal word like جيدة
• مج as a common everyday loanword
• Egyptian pronunciation of ج as g

A more formal Standard Arabic version would probably use different vocabulary, such as a word closer to سُمك for thickness and a more formal word for mug/cup.

Yes, but that means something slightly different.

• المج تخين = The mug is thick
• تخانة المج كويسة = The mug’s thickness is good

So the first sentence describes the mug directly with an adjective. The second sentence talks about the quality of its thickness as an abstract noun.

Both are natural, but they are not exactly the same structure.