The Greek word "oompa" does not have a specific meaning in the Greek language. It is possible that it is a transliteration or a misspelling of a Greek word, or it could be a non-standard term. In order to provide an accurate translation or explanation, more context or information would be needed.
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I think you are referring to the exclamation, "Opa!" This is somewhat of the equivalent of shouting 'yay!" or "whoopee!" It doesn't really have a direct translation or meaning.
It is not a word, it is more of a sound. It just adds a little extra to a sentence or an action. It does not really have a specific meaning to it.