Molim te, dodaj mi još jedan ubrus; prosula sam malo soka.

Molim te literally means I ask you or I beg you, but in everyday Croatian it often simply means please when speaking to one person informally.

• molim = I ask / please
• te = you (singular, informal, accusative)

So Molim te, dodaj mi... is a natural way to say Please, pass me...

If you were speaking formally or to more than one person, you would usually say Molim vas.

Dodaj is the imperative form of the verb dodati, meaning to pass, to hand, or to add, depending on context.

Here it means pass or hand over:

• dodati = to pass / hand / add
• dodaj! = pass! / hand over!

So Molim te, dodaj mi... means Please pass me...

Mi means to me.

It is the unstressed dative form of ja (I):

• ja = I
• meni = to me (stressed/full form)
• mi = to me (short clitic form)

So:

• dodaj mi ubrus = pass me a napkin

Croatian often uses these short clitic forms where English uses a normal pronoun.

Croatian word order is more flexible than English, but short pronouns like mi often go in an early position in the clause.

So dodaj mi još jedan ubrus is very natural:

• dodaj = pass
• mi = to me
• još jedan ubrus = one more napkin

You may also hear variations depending on emphasis, but this version is standard and natural.

Još jedan means one more or another.

• još = still, yet, more
• jedan = one

Together in this context:

• još jedan ubrus = one more napkin / another napkin

It implies that one napkin is not enough, probably because some juice was spilled.

Because ubrus is the direct object of dodaj, so it should be in the accusative singular.

However, ubrus is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: ubrus
• accusative: ubrus

That is why the form does not change here.

In this sentence, ubrus means napkin, especially a table napkin or paper napkin used while eating.

It does not usually mean towel. A towel is normally:

• ručnik = towel

And a tissue is often:

• maramica = tissue / handkerchief

So because the speaker spilled juice, ubrus is the natural choice for napkin.

Prosula sam is the past tense of prosuti (to spill) for a female speaker.

Croatian past tense is formed with:

• a past participle
• plus the auxiliary sam (I am, used here to form the past)

So:

• prosuo sam = I spilled (male speaker)
• prosula sam = I spilled (female speaker)

The sentence uses prosula sam, so the speaker is female.

In Croatian, the past participle agrees with the subject in gender and number.

So with I:

• male speaker: radio sam, prosuo sam
• female speaker: radila sam, prosula sam

English does not do this, so it often feels unusual to learners. But in Croatian, it is completely normal and necessary in the past tense.

Both are possible in Croatian, but prosula sam is very natural.

The short auxiliary sam is a clitic, and Croatian clitics usually appear in the second position of the clause. In real sentences, this often leads to word orders that do not match English.

So:

• Prosula sam malo soka. = natural
• Ja sam prosula malo soka. = also possible, with ja adding emphasis

The version in your sentence is standard and idiomatic.

Malo soka means a little juice.

The important point is that after quantity words like malo (a little), Croatian usually uses the genitive.

So:

• sok = juice
• soka = of juice / some juice (genitive singular here)

This is why you get:

• malo soka = a little juice

This is very common in Croatian:

• puno vode = a lot of water
• malo kruha = a little bread
• dosta vremena = enough time / a lot of time

Because Croatian often expresses relationships like a little of juice just by changing the noun’s case, rather than adding a separate word like of.

So English says:

• a little juice

Croatian says:

• malo soka

The genitive case on soka does the job that English often handles with of or with word order alone.

Depending on context, prosuti can mean something like spill or pour out/scatter, but in this sentence the meaning is clearly spill.

That is because of the situation:

• asking for another napkin
• explaining the reason

So here prosula sam malo soka is naturally understood as:

• I spilled a little juice

The semicolon links two closely connected ideas:

• Molim te, dodaj mi još jedan ubrus
• prosula sam malo soka

The second part explains the first: the speaker wants another napkin because she spilled some juice.

In normal informal writing, many people would also use:

• a comma
• a dash
• or even split it into two sentences

So the semicolon is correct, but not the only possible punctuation.

Yes, but the tone changes.

• Daj mi još jedan ubrus. = more direct, like Give me another napkin
• Molim te, dodaj mi još jedan ubrus. = more polite, Please pass me another napkin

Also, dodaj mi specifically sounds like pass me something nearby, which fits a table situation very well. So the original sentence sounds especially natural in context.