FOYC 

Fuck off you cunt

Ryan: Grow up
Me: FOYC

FOYC by FOYC April 23, 2011

foyc 

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

foyc by ArbiterElegantiarum September 23, 2021

idiot foyce

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?

idiot foyce by jameelaa October 27, 2009