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1.
A facial expression resembling one worn by passengers on any public metropolitan bus system. Busface is most accurately described as an equal mixture of the facial gestures commonly correlated with despair, anger and fear.
Jake: I saw Megan earlier and she had a serious busface.

Smitty: Yeah, she just got laid off from her spreadsheet making temp job.
by The Real Sweet T September 15, 2009
 
2.
The appearance and demeanor a person possesses that makes them instantly recognizable by the people on the bus (or other forms of public transportation) desperate to have a conversation. A person with bus face usually appears pleasant, friendly, thoughtful and patient, and most importantly, ready to listen to all the way too personal and/or awkward stories that other people who ride the bus have no one else to tell.
Suzie wanted to sit quietly on the bus ride to school, but the old man sitting next to her saw her bus face and forced her into a 20 minute long conversation about constipation.
by Golden Vanilla October 16, 2011
 
3.
Refering to a person, usually a female, who has a face that causes an observer to infer that he/she was hit by a bus... in the face... repeatedly.
John wouldn't bone Patrice because her busface would in all certainty leave him as limp as a soggy sandwich.
by Adam NDowd April 17, 2007
 
4.
When you're on the bus and you see somebody who pisses you off and you want to mad dog them.
You're 12 years old and sitting on the bus and an elderly person gets on and you don't move for them? You may get the busface.
by dh-work December 10, 2007