Green’s Dictionary of Slang

(US) a mild exclamation of frustration/irritation.

1842		Lorain Republican (OH) 23 Feb. 2/2: A majority of 126 voting to reject a petition. Oh! soap-suds and whiggery!!
[1849		A Life’s Revenge in Lacy's Acting Edition of Plays 37 19: Grim. The prisoner has already several times attempted his life — you could say he threw himself on the razor and — Sim. Oh , soap suds and sal volatile ! What did you say? ].
c.1907		H. Doyle John—Poor John in Philadelphia Press n.d.: [cartoon caption] © !! Soap Suds.
1910		Fort Riley Guidon (KS) 7 Jan. 3/4: A certain trumpeter in D Battery is suffering from the gout. We fear he has been eating too many chicken sandwiches on ‘haybag’ row. (Oh you ‘soap-suds’!).
1925		Munsey’s Wkly 86 454: ‘[O]h, soap suds!’ She stamped her foot in a mud puddle, and splashed both of them.
1933		Salem News (MA) 22 May 1/5: Essays — Ruth Ruggy, — The Convalescent’, first; Margaret Megrall, ‘Oh Soap Suds!’ second.