Green’s Dictionary of Slang

1. of actions or inanimate objects, very easy, easily achievable or attainable [abbr. of easy as pie under easy as... adj.].

1888		World (N.Y.) 29 Sept. 6/6: Those who imagined that the Wolverines would be pie for the pennant-winners yesterday were sorely disappointed.
1899		Ade Fables in Sl. (1902) 27: It was simply Pie for him to tell in what year Anse began to play with the Rockfords.
1900		Flynt & Walton Powers That Prey 182: I ain’t leary, I ain’t; but it’s pie to take your constitutional without everybody rubberin’. Say, I guess I’ll take a bit of a leg-loosener an’ see ’bout bankin’ that dough in London.
1912		D. Lowrie My Life in Prison 282: The dough is pie for us if you’ll say you did it.
1920		Ade Hand-made Fables 30: Some of the Steps were easy and others had been thought out by Contortionists, but they were all Pie for Oliver Cromwell Wilton.
1925		Wodehouse Carry on, Jeeves 201: Naturally a mere article would be pie for her.
1935		(con. 1920s) J.T. Farrell Judgement Day in Studs Lonigan (1936) 607: It had been pie for many guys, why not for him?
1949		Wodehouse Mating Season 110: It’ll be pie.
1953		J. Thompson Savage Night (1991) 50: It was too much pie.
1967		G.F. Fiennes I tried to run a Railway 26: In the current work York was pie compared with Cambridge. There was far less pressure.
1972		Wodehouse Pearls, Girls and Monty Bodkin 53: Interesting Llewellyn in Silver River would be pie, but I’d also have to interest her, and she’s not the right woman for that.
1996		Eble Campus Sl. Sept.

2. of individuals, susceptible, easily conquered, a ‘pushover’.

1898		B.L. Standish Frank Merriwell’s Cruise 72: He is pie for Thomaston, but he makes monkeys of our men.
1904		G. Ade Breaking into Society 158: Also he was Pie for the Dignified Gentlemen representing the Eastern Publishing House.
1905		Sun. Times (Perth) 8 Oct. 4/8: — found a quid punter at Kensington. ’e was pie.
1905		H. Green Actors’ Boarding House (1906) 118: My she’s pie [...] just con her along, that’s all.
1914		R. Lardner ‘Horseshoes’ in Coll. Short Stories (1941) 265: Young Joyce had been pie for Tesreau all day.
1920		Wodehouse Coming of Bill 54: This Kid Mitchell was looked on as a coming champ in those days. I guess I looked pie to him.
1936		C.J. Brim Medicine in the Bible 249: We say, ‘he’s pie for us’ or ‘he is our meat,’ when we wish to signify that our opponent will be easily conquered.