Useful Brazilian Portuguese Idioms. If you are planning to spend some time in Brazil this year, especially during the "Carnaval" you have to know which idioms or expressions are booming on people's lips. Check the list below with 5 key Brazilian words and ask me if you have any questions: 1. Lacrou - Used to talk about something which is very cool, something that everybody likes. It is also used about something which someone did and everyone approved, like a goal reached. 2. Miga - Used to refer to a friend, especially a female friend. 3. Miga sua louca - Used to refer to a Miga who does something very crazy. 4. Deu onda - Used to describe something made by someone else or something that naturally happens and makes you feel so good. It is like something unexpected that happens.