As I mentioned in the previous post, Japanese men do not puff out their cheeks to show anger as women do, but all Japanese will pucker their lips to show frustration or when contemplating over news just received, especially if it's something they didn't want to hear. They've hit a wall, and this face means their thinking about how to respond or what to do next. "what's plan B?" It's very common, and I find myself using this gesture unconsciously.
It may also come with a very audible sound of sucking in air through the teeth. This also shows contemplating what's next or if their uncomfortable in a conversation.