look up any word, like the eiffel tower:
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.
by Mudlido November 17, 2009
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
by Elyn March 17, 2007