The term you use to describe a situation when you are not ona straightface-to-face conversation with someone or the person is not present in front of you
Mike: Hey, you asked out Hellen yesterday on chat. Didn't you?
Jack: F**k off! Do you think I would do something so lame like asking out someone off face?
To settle an argument two men stand face to face and feverishly masterbate. The first to ejaculate on the other wins.
Today Rick and Barry really got into it. It ended up in a face off and when the smoke cleared you could really tell by the mess who won, poor Barry he was a real mess.