Autocorrect Can Be Really Evil -- With Help
Android and iOS both have different methods for predicting what you're attempting to type, and then replacing it with the anticipated word. But sometimes Autocorrect (iOS), or the Custom Dictionary (Android), uses the wrong word. With a bit of your help, you can replace a common word such as "OK" with "you smell funny," or any word or phrase you choose. On iOS, add your own shortcut in "Keyboard Settings." On Android, you can add a phrase using a shortcut under "Keyboard/Input Settings."