You are such a No-maj (pronounced "no madge" like "no magic").
What!? Are you surprised? J.K. Rowling revealed this week that as usual, the Americans have their own way of doing things. In the upcoming movie, "Fantastic Beasts And Where To Find Them" brings the wizarding world stateside. And naturally, the traditional words that may be used by our favorite characters in the original Harry Potter series don't seem to fly in the US.
In the original series, Harry Potter, Hermione Granger, and Ron Weasley, are all familiar with the term "muggle". The term "muggle" is a person who posses no magical abilities or skills. For wizards and witches, it's a complete insult to be referred to as a muggle because it associates you with those of normal human race. And as everyone knows, if neither of your parents or grandparents have wizarding powers and you somehow are born with them, then you will be subjected to the highest of offenses which is to be referred to as a "mud-blood".
In the movie, the lead character English magizoologist Newt Scamander is played by Eddie Redmayne. He travels to New York where he enters American society which to no surprise is drastically different than the Londoners. Throughout the film, the term "no-maj" is frequently dropped speaking about persons who don't posses the magic powers. It'll be interesting to see if in America, wands are sold at Walmart in a secret location. I mean, it would only make sense.
But for now, go ahead and enjoy the word "muggle" until the Americans come along to tell you that you're saying it wrong.