Removing "yo" from my autocorrect I'm using Android 4.4.2 on my Galaxy S4 and using keyboard layout Icecream Sandwich.  I want to program my phone that when I incorrectly type yo that it autocorrects "to".  I don't recall when it stopped doing this, but it is very frustrating to be saying yo all of the time because of fat fingers.
You must have accidentally disabled the auto correct option under your keyboard settings. 
Go to Language and input --> select your preferred keyboard and goto its settings --> search for the auto correct checkbox and mark it to true.