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deeker1 noun an eye 20-. etymology: a development of deek; attested by Galloway Tinkler-Gypsies and known in Edinburgh Scots; also collected by Simson (1865) note:

Canadian Paul Pope (2013) also cites this form but meaning ‘a good-looking woman’.
deeker2 noun ‘a thief kept in pay by a trap’ [policeman] 19. etymology: origin obscure; attested by Grose and Egan (1823) as Scotch Cant note:

‘Trap’ meaning a policeman or thief-taker survives in Australian slang. J H Vaux author of A new and comprehensive dictionary of the flash language [1812] was transported to Australia as a convict. Twice!