Green’s Dictionary of Slang

(US) the opposite, the reverse, an exchange, e.g. of second-rate goods for the better ones expected.

1933		Forum Dec. 372/2: We’ll pull a switcheroo. We’ll use olives instead [of cherries] .
1941		B. Schulberg What Makes Sammy Run? (1992) 73: All you gotta do to that story is give it the switcheroo.
1952		(con. 1920s) ‘Harry Grey’ Hoods (1953) 92: Pipy pulls a switcheroo on Nutchy, get it?
1965		J.P. Carstairs Concrete Kimono 71: Any moment the big switcheroo will happen.
1978		L. Kramer Faggots 322: Effect her switcheroo, now in the darkness she does it! He does it!, an exchange of orifices has been made.
1990		(con. early 1950s) J. Ellroy L.A. Confidential 203: Switcheroo. ‘You don’t read the papers too good, right?’.
2000		P. Temple Dead Point (2008) [ebook] This most dreadful rig trader. Can you believe the man’s tried the old switcheroo on us?
2002		Record (Hackensack, NJ) 3 Nov. 19/1: The last minute switcheroo is wrong.
2011		Akron-Beacon Jrnl (OH) 17 Oct. A011/2: If it’s clear that Democrats need to do something dramatic to avoid losing the White House, the Switcheroo will happen.
2022		J. Hannaham Didn’t Nobody Give a Shit 84: ‘You had a child as a man and then you made the switcheroo. That was smart’.