Green’s Dictionary of Slang

rubbish! nonsense!

1837		A. Greene Glance at N.Y. I v: Oh, gas!
1848		‘Ned Buntline’ Mysteries and Miseries of N.Y. V 64: Gas! He’s a stuffin’ you, Charley!
1850		‘Ned Buntline’ G’hals of N.Y. 15: Oh, gas!
1866		H.L. Williams N.-Y. After Dark 23: Gas! talk’s cheap!