Green’s Dictionary of Slang

hogwash! excl.

rubbish!

1952		W.D. Overholser Fabulous Gunman 124: A man next to Slade laughed. ‘Hogwash, Ira.’.
1965		P. Highsmith Suspension of Mercy (1971) 177: Hogwash! You tellin’ me!
1978		P. Theroux Picture Palace 134: ‘Hogwash,’ I said.
2000		P. Beatty Tuff 163: The grassy knoll — bullshit. The book depository — hogwash. Oswald, Ruby, Oliver Stone — CIA subterfuge.