1. Insult that suggests someones face is a bit messed up, ugly, gross etc.
2. A goodbye to use when on the phone. This replaces what you would normally say as a farewell. This also works better if said very quickly, followed by abruptly hanging the phone up.
1. Fuck you Dave and I'm sorry about your face.
2. "Ok mum, i gotta go. Sorry about your face." And then hang up the phone.