المطر بلل مظلتي الجديدة شوي، بس ما بلل جراباتي.

This sentence uses subject–verb–object order:

المطر بلل مظلتي

That is very common in spoken Levantine. It sounds natural and conversational, and it puts the focus on the rain as the topic.

Arabic can also use verb-first order, for example:

بلل المطر مظلتي

But in everyday speech, starting with the subject is extremely normal.

بلل means wet or made wet.

In this sentence, it is a past tense verb: wetted / got wet.
So المطر بلل مظلتي means the rain wet the umbrella.

A few useful notes:

• It does not necessarily mean soaked completely.
• It often suggests made damp / got wet.
• In pronunciation, it is typically ballal. The written Arabic usually leaves out the short vowels.

Because in Levantine Arabic, past-tense negation is usually very simple:

ما + past verb

So:

• بلل = wet
• ما بلل = didn't wet

Arabic does not need a separate helping verb like did.
So ما بلل already means did not wet.

Because the subject is already clear from context.

After المطر بلل مظلتي الجديدة شوي, the next part بس ما بلل جراباتي naturally means:

but [the rain] didn’t wet my socks

Arabic often leaves out repeated subjects when they are obvious.
You could repeat المطر, but it would sound less economical.

Arabic usually adds possessive pronouns directly onto the noun as suffixes.

Here, -ي means my.

So:

• مظلة = umbrella
• مظلتي = my umbrella

There is an important spelling pattern here:

When a noun ends in ـة and you add a suffix, that ـة becomes ـتـ:

• مظلة
• مظلتي

That is why you see ت in the middle.

Because in Arabic, adjectives usually come after the noun.

So:

• مظلتي الجديدة = my new umbrella

This is the normal order in Arabic, unlike English.

The adjective also has to agree with the noun. Since مظلة is:

• feminine
• singular
• definite (because it is my umbrella)

the adjective must also be:

• feminine
• singular
• definite

So you get الجديدة.

Because مظلتي is already definite by possession.
My umbrella is automatically a specific umbrella.

In Arabic, when a noun is definite because of possession, its adjective is also definite, so the adjective takes الـ:

• مظلتي الجديدة

Even though مظلتي does not have الـ, it is still definite.
So الجديدة correctly appears with الـ.

شوي means a little, a bit, or slightly.

So:

بلل مظلتي الجديدة شوي
= it wet my new umbrella a little

This is a very common Levantine word.
You may also hear شوية, which usually means the same thing.

Here, بس means but.

So the sentence is contrasting two ideas:

• the rain wet the umbrella a little,
• but it did not wet the socks.

Very common meanings of بس in Levantine include:

• but
• only / just
• sometimes enough

So the exact meaning depends on context.

Yes, in Levantine it is very normal.

• جرابات = socks
• جراباتي = my socks

This may look unfamiliar if you learned more formal Arabic first, because in MSA you are more likely to see:

• جوارب = socks
• جواربي = my socks

So جراباتي is a good example of everyday Levantine vocabulary.

A rough pronunciation would be:

il-matar ballal maẓallti l-jdiide shwayy, bas ma ballal jrabaati

A few pronunciation notes:

• بلل sounds like ballal
• مظلتي is often pronounced compactly, something like maẓallti
• شوي may sound like shwayy or shwi, depending on the region

Exact pronunciation varies across Levantine varieties, but that gives you a good general idea.