Green’s Dictionary of Slang

1. (UK Und.) to look at, to see.

1864, 1867, 1870		Hotten Sl. Dict.
1888		J. Runciman Chequers 78: I dicked a bar and a pash-crooner (I saw a sovereign and a half-crown).
1894		Pall Mall Gaz. 4 July 3/2: ’Ere’s a tec. D’yer dick his goggles and ’is blanky daisies.
2012		E. Petulengro Caravans & Wedding Bands 110: ‘Dick you in a bida’ (See you in a minute).

2. in milit. use, to reconnoitre.

2007

S. Low Boys From Baghdad 219: There seemed no doubt that the premises would be constantly dicked, and this visual SOP would persuade the insurgents to try their luck elsewhere .