yfos 

You'r full of shit.
Use to scold a person who bluff and talk about something that is untrue.

A: I just hv sex with your bitch. Dude, you are pwned!
B: My balls. Yfos

yfos by Elyn December 15, 2008

YFOS 

YOUR FULL OF SHIT, ACROMYN To be shouted out during TV news when the talking heads utter banal stupid stuff.

It's 7 Oclock time for Oberman to spew. I want to grab his ears and yell YFOS so he gets the message.

YFOS by Mudlido November 17, 2009