Even though you can simply your text messages (and reduce overall character usage) by typing in shorthand. However, autocorrect will attempt to and fail miserably at correct your “mistakes.” If you want to type in type in a full word without manually inputting each individual character, here’s a quick trick.
Go to Settings and choose General. Then, navigate to the Keyboard section, tap Text Replacement, then hit the + sign on the top-right corner. Here, you can input abbreviations for words you use frequently, and your messenger will automatically put in the whole word when you press space. This is also a great feature to troll your parents.