Adjective
full of shit (comparative more full of shit, superlative most full of shit)
(vulgar, derogatory) Characterized by speaking nonsense or falsehoods.
You don't know what you're talking about. You're full of shit!
If ketchup had 1/20th of the carcinogens in a cigarette they'd rip it off the shelves tomorrow, so the government is full of shit when they tell you that they care about you. Bill Maher