To stand someone up, or to fail to appear at a scheduled meeting or appointment without notice, is one of the most disrespectful things you can do.

A referee's whistle signaling the start, end, or a foul in a soccer game. It can also refer to a privileged piece of information or a timely warning.

Someone completely crazy, unpredictable, and lacking self-control, used across the Spanish-speaking world

To pass the buck, to dodge responsibility by pushing it onto someone else. Like tossing a ball to the next person so you do not have to deal with it. Common in Argentina and Uruguay when talking about people who avoid taking ownership of a problem.