بكرا عندنا ضيفة عالعشا، فامي عم ترتب البيت.

In Levantine, عند plus a pronoun often expresses possession.

• عندي = I have
• عندك = you have
• عندو = he has
• عندها = she has
• عندنا = we have

Literally, عندنا is closer to at us / with us, but in natural English it often translates as we have.

ضيفة is the feminine form, so it means a female guest.
The masculine form is ضيف.

So:

• ضيف = male guest
• ضيفة = female guest

The sentence uses ضيفة because the guest is female.

عالعشا is a contracted colloquial form of على العشا.

• على = on / at / for
• العشا = dinner / supper

In speech, على is often reduced to عَ, especially before ال words, so على العشا becomes عالعشا. In this sentence, it means something like for dinner or over for dinner.

Here, فامي is best understood as فـ + أمي / إمي.

• فـ = so / then
• أمي / إمي = my mother

So the meaning is so my mother... In casual Arabic writing, short connector words like فـ are often attached directly to the following word. You may also see spellings like فأمي or ف إمي, depending on writing style.

عم is a very common Levantine marker for an ongoing action, similar to the English am/is/are ... -ing.
ترتب is she arranges / she tidies.

So عم ترتب means she is tidying or she is arranging.

Because the subject is أمي / إمي = my mother, the verb must be 3rd person feminine singular: she tidies.

In Levantine, many speakers use عم + imperfect without بـ, so عم ترتب is very normal. Some dialects or speakers may also say عم بترتب. Both patterns exist, but عم ترتب is perfectly natural.

Arabic often uses the house when the house is already obvious from context. So ترتب البيت naturally means she’s tidying the house, and in context that means our house / the house we live in.

If you say بيتنا, that adds extra emphasis to our house specifically. Both are possible, but البيت sounds very natural here.

In Arabic, the present tense usually does not need a separate word for is / am / are the way English does.

So instead of something like my mother is..., Levantine simply says أمي عم ترتب. The idea of is tidying is already built into عم + verb.

The letter ع is a throat sound that does not have a direct English equivalent. In عندنا and عالعشا, it appears right at the beginning.

A good beginner strategy is:

• listen carefully to native speakers
• try to imitate the throat placement
• don’t replace it with a strong English g or k sound

Even if your ع is not perfect at first, that is normal. It usually improves with lots of listening and repetition.