I would assume an official act is something outlined in their description of their powers like the president appointing someone, and not just every word and act

I would assume an official act is something outlined in their description of their powers like the president appointing someone, and not just every word and action they do while holding the job as president. I wouldn't think him cussing after a shank during golf would be an official act as the POTUS for example, although I'm sure it happened thousands of times during his presidency.