Full of it/Full of yourself?

[Antonio]

Hi Group,

What does it mean "you're so full of it or full of yourself" I personally don't get it, what are you traying to say? Can you give me some examples to understand better the phrase and the context too?

Thanks in advance,
Antonio.

[Tdol]

Full of yourself= Bigheaded, conceited.

Full of it = 'it' refers to sh*t

[MW]

Arrogant

or

A bullshitter