The expostulation (?) is almost campy at this point in the franchise. Is there a canon translation?
I am always reading it as "Hot damn!" or "Hey, Raul!" but would be delighted to learn of its intended meaning in-universe.
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This is according to the (canon) factbook Star Wars: Absolutely Everything You Need to Know
In Legends canon, the word is described thusly.
For most travelers, especially those alone in the desert wilderness, the first sound you are likely to hear in a Jawa encounter is "Utinni!" which is a battle cry of sorts, a triumphal call to all other Jawas nearby that prey has been located. The cry also is used as a great exclamation, proclaiming great wonder or excitement by whatever impresses them.