It means winds, on regular spanish. But in Mexican slang, it means good, because bien (good in Spanish) and vientos, hyave the same sound at the beginning. When used, you use it alone. You can’t form sentences that use the word good in Spanish, with “vientos”.
Mañana llega tu paquete – Vientos / Your package arrives tomorrow – Good
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I hope you have learned something new, about the spanish that real Mexicans talk on their everyday life.
If you want to improve your Spanish, I also give tutoring lessons on skype using this page that host many teachers from all over the world, and while I don’t really do grammar, I can help with conversation and doubts about the language. Also, if you are interested in any language besides spanish, there are teachers and tutors for any language there.