The most consistent way to revert is detailed in the steps below.

1. Hold both LS and RS in the direction you want to revert.
2. When you start rotating, begin holding LT as well.
3. When your board is about 90° to your direction, pull LS down at an angle left/right (depending on BS or FS).
4. Be sure to continue holding the RS in the direction of the spin.
5. If everything is done correctly you should revert. (It won't always say Butter 180)



Other Tips:

• To make things much easier, you can pull RS in the same direction as LS in step 3. It will say you did a press, but it will look just as smooth.
  
• This game is physics based, so carving into the revert can help give momentum to complete the turn.

Hope this helps. If you know a better way, please feel free to add it to the comments!