Used with a hashtag in social media streams - foyc alerts admins to commercial posts (spam) snuck into comment threads
Might be a corruption of “fake”, or the o may stand for “off”. Who knows.
John Smith: It’s great tone part of the winning team trading bitcoin using <blah>
Me: #foyc
Another word for 'idiot face' used a lot when someone says something more idiotic than idiot.
He's such an idiot foyce, like, how stupid can you get?