John Thadeus McDonald means in slang: John Thadeus McDonald’s is an interesting man. This is his Thad walk. Jack will coach your youth football team even though you have to do a lot of work. Although he will drive you, he is not a chauffeur. He is an OL Savage. But, even more, he is a friend. John T. McDonald’s is a strong man who will endure any roast that you throw at him. Jack, despite being a large ole boy that plays O Line, could be argued to play tight end. (in Slang Dictionary, added by Kaley Montgomery)