'Don't be such a wally,' Ruby said. 'Felicity is way smarter than you could ever hope to be.' 2014, Richard Newsome, The House of Puzzles, page 111:
(Essex, London, colloquial) A large pickled gherkin or cucumber.
Mushy peas (£1.40) are ... mushy, and wallies (45p) – pickled gherkins to you – come sliced and prettily served in the shape of a flower. 2003, Charles Campion, The Rough Guide to London Restaurants, page 215:
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wallies
Number=Plur
lexicographic
wally en · ADJ · etymology 2
Meanings
(alt-of, alternative, not-comparable, of eyes) Alternative form of whally
[…] one of his eyes was wally, a condition common among the natives of the land. (Here the meaning 'pale' is intended, as indicated later in the text:) […] turned his one black eye on the kindly man […] (p. 183) 1938, Xavier Herbert, chapter XI, in Capricornia, New York: D. Appleton-Century, published 1943, page 179: