Start this problem with both hands on the right side of the crack with both feet on the left side. Getting the start and the next few moves seems to be the crux of the problem for most. The feet are getting polished, no doubt by all the traffic this problem sees.
The higher you go, the wider the crack gets: it gets easier to lieback the further away from the ground you get. There are some large holds on the right face that can be used as well once you get high enough. If you are tall enough, then you can reach the top from a standing position on one of those large holds, but if you want the full lieback experience, then stay in the crack until you top out.
Located in the obvious off-width crack on the north-east side of of the Split Boulder.
There is a great flat landing for this problem.
Big Mouth V1: The first problem in the area, and ...