To show off, to brag, to flaunt what you have. In Mexico, when someone "se da taco" they are making sure everyone notices how great they are, whether it is their car, their clothes, or their accomplishments. It is pure peacocking.

Shameless audacity, the ability to do or say something unacceptable without showing any shame, leaving others speechless

In all of Latin America, a child or person who goes to tattle to the authorities at the slightest problem. The acusetas always knows more than they should and never keeps a secret.

To make a fool of oneself in public by saying or doing something inappropriate, wrong, or clumsy, resulting in visible embarrassment. It is one of the most universal and unavoidable experiences of human social life.