I say it's spinach (sometimes given in full as I say it's spinach and I say the hell with it or further abbreviated to just spinach) is a twentieth-century American idiom with the approximate meaning of "nonsense" or "rubbish". It is usually spoken or written as an anapodoton, thus only first part of the complete phrase ("I say it's spinach") is given to imply the second part, which is what is actually meant: "I say the hell with it."