Green’s Dictionary of Slang

smack in the eye n.²

a pie.

1944		Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3.
1960		J. Franklyn Dict. of Rhy. Sl.
1980		(con. 1920s–1930s) Barltrop & Wolveridge Muvver Tongue 11: Referring to my father again, he would say [...] ‘I had a smack in the eye (a pie) in that coffee-shop.’.
1992		R. Puxley Cockney Rabbit.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.