To sidle or sneak along walls to avoid being noticed, typically because you are ashamed or trying to hide something, like being drunk. (The term plays on walking along the edge or side of a space to stay out of sight.)
Since I got home drunk, I had to andar de costaneras all the way to my room.
A distraction or diversion, especially in politics or media, where one news story is emphasized to hide or draw attention away from a more controversial or serious event.
The dengue news is a cortina de humo to keep people from talking about the currency devaluation.
To get one's hair covered in powder or flour during certain street festivals (specifically the feast of Saint Andrew, where it is tradition to throw flour, eggs, and water at people).
An expression used when a situation is suspicious or there is a hidden motive behind an action. (A macuto is a traditional woven straw bag used in the Dominican countryside).
Wait! Maria didn't go to the beach yesterday. There is gato entre macuto there.