be full of crap/shit/it
From Longman Dictionary of Contemporary Englishbe full of crap/shit/itbe full of crap/shit/itnot politeWRONG/INCORRECT a rude expression used to say that someone often says things that are wrong or stupidDon’t listen to Jerry. He’s full of it. → fullExamples from the Corpusbe full of crap/shit/it• His head was full of it.• The very donkey boys were full of it.• Usually her hands are full of it.• Television is full of it about election time.• Black cats are full of it, while pale animals have less.