Bus look refers to a blank facial expression (somewhat similar to a poker face) used while riding a bus. A person sustaining a bus look is often in deep thought or examining the surrounding people. Off the bus, this can be considered acting Stoic.
Example:
I stepped on the bus and looked down the aisle, all I saw were a bunch of people with bus looks minding their own business.
我上车后向另一头望去,看到的都是些摆出“公车表情”、忙着各自事情的人。