What does Tranquilo mean?

"Tranquilo, it's all going to be fine," she said to calm her friend before the exam.

Dutch student slang. This is a Dutch word. You will hear it a lot at Dutch universities, student associations and in student houses.

You use it when someone drank too much or is stressing out. Dutch students borrowed it from Spanish and never gave it back. Short version: tranqi. Also read about bueno and vino.