English is a language where you can add whatever words you frickin want because there is no body that actually forces the English language to stay the same, and instead the only bodies on the English language are either advisory or descriptive. This means that you CAN make your own adjectives, you CAN make your own pronouns, and you CAN make up any word you want and have it mean anything. "Frindle", despite being a joke, is a real and valid English word simply because people use it.