Green’s Dictionary of Slang

a general excl. of disbelief: nonsense! rubbish!

1847		J.M. Field Drama in Pokerville 74: Mr. Waters [...] paced the bar-room of the hotel ejaculating ‘pickles!’.
1859		G.A. Sala Twice Round the Clock 242: He [...] sent men into the house to hiss and cry out ‘pickles’ when Toobey the tragedian was performing.
1863		Criminal Life (NY) 19 Dec. n.p.: He [...] thinks himself a sport. Pickles!
1864, 1867, 1870		Hotten Sl. Dict.
1868		‘Parliamentary Vade Mecum’ in Sydney Punch 14 Mar. 8/1: Interjections [...] Pickles!
1906		E. Pugh Spoilers 71: ‘Pickles!’ she said elegantly.
1908		Salt Lake Herald (UT) 29 Nov. 17/3: ‘Guess who’s here,’ says I. ‘That you, Roland,’ says she. ‘Aw, pickles,’ says I.
1911		E.B. Morris Sophomore 35: Brown. Oh, puh-puh-pickles.
1979		S. King Long Walk in Bachman Books (1995) 172: ‘Just shut up!’ ‘Oh, pickles,’ McVries said.