Green’s Dictionary of Slang

to look at.

1859		Matsell Vocabulum 25: deek the cove See the fellow; look at him.
1895		Crowe Aus. Sl. Dict. 23: Deek the Cove, look at him.
1993		I. Welsh Trainspotting 28: Deek him sniggering like a moron wi a joint in his hand.
2012		(con. 1980s) I. Welsh Skagboys 345: Ah lifts ma shirtsleeve n deeks at this scrtatchy sore oan ma airm.