- To play a game without thinking about it or using strategy.
- To play through a particular boss or dungeon while ignoring the mechanics of that boss or dungeon.
- To play in a way that's analogous to rolling your face on your keyboard.
It's commonly used in World of Warcarft, where people who are over-geared or over-leveled for the dungeon that they are in, can finish it, despite mindlessly ignoring the mechanics of the dungeon.
This dungeon is so easy that you can just faceroll it.