So, "fourteen words" is a phrase that some people use to represent a white supremacist slogan. Essentially, these people use the phrase "fourteen words" to refer to the idea that white people are better than people of other races, and that they need to protect their race so that it doesn't get mixed with other races.
Now, this is obviously a very bad and untrue idea, but some people believe it. So when you hear the phrase "fourteen words," just remember that it's talking about something that's not true or good. We should always treat everyone with kindness and respect, no matter what their race is.