Rodrigo talks to Marcus and Dogface that he curses in Portuguese, and when he explains he uses the word "Idiota", Dogface has to find out it's meaning.

The conversation starts when Rodrigo talks about how Charlie show his bum in public and does care.

This behaviour makes Rodrigo swear in Portuguese.

He went on to explain that he doesn't really use swear words, and the word he uses is "Idiota"

Dogface repeats the word "Idiota" and then asks "What's that mean?"

Idiot.