A personal conjecture towards another informing them that you do not believe what they are saying. A way of telling someone that what they are telling you is a big steamy pile of smelly bullshit. Hence they would be "full of shit".
Synonyms for You are full of shit
On this page, you will find 30 slang terms related to You are full of shit. Some of the top words include: talking trash, barrold, Womper-stinker, my ass, dish, and 25 more.