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Some people make the mistake of taking "Latin America" as one big lump when it comes to language. Although we all speak Spanish you will find that each country has their own idiosyncracies and language is extremely diverse. This word is a clear example of how the meaning varies according to the country. You need to be extremely careful, what in one place could mean something good, it could be an insult somewhere else.
Is it clear from your text exactly who is getting the 15% raise (which sounds like a lot until you realise that inflation is 25% and most union wages are going up here by that amount)? Because if it is the co-worker, it would rule out all the "lucky" answers.