The face a person makes that makes them look as if they are angry, irritated, or depressed, but are usually just relaxing or deeply thinking about something.
A disorder in which a person has a face that makes you think he/she is a bitch. Said person might not actually be a bitch, but they look like one. BFS can be used for short.
Chris: Wow, that girl has a severe case of Bitch Face Syndrome.
Mandy: Yeah, she looked pissed off for no reason.
Similar to resting bitch face, but with texting. This usually happens when you end your texts in periods or don't use emoticons, which makes the person you're texting think you're pissed at them.
Person 1: (text) Party at Jeff's tonight! See you there?
Person 2: (text) K.
Person 1: (text) Do you not want to go, or is that just texting bitch face?