Green’s Dictionary of Slang

kool v.

[backsl.]

to look (at).

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[UK]Sam Sly 3 Feb. supp. 5/1: Sam will let out more than Frank thinks he is in possession off. Kool out; read that backwards, lad.
, [UK]Hotten Dict. of Modern Sl. etc.
[UK]A. Stephens ‘The Chickaleary Cove’ 🎵 Now kool my downy kicksies – the style for me, Built on a plan werry naughty.
[UK]Sl. Dict.
[Aus]Sydney Sl. Dict. (2 edn) 11: Kool - To look. Kool him - Look at him.
[UK]N. Devon Jrnl 8 Feb. 7/2: [from The Echo] Hi yob! Kool that enif elrig with the nael ekom (Hi boy! look at that fine girl with the lean moke).
[UK]W.E. Henley ‘Culture in the Slums’ in Farmer Musa Pedestris (1896) 179: Joe, just you kool ’em – nice and skew / Upon our old meogginee, / Now ain’t they utterly too-too?
[US]National Observer 27 Feb. 378: Look at my pearlies, kool my ’ed of ’air [F&H].

In exclamations

kool esclop! (also kool esilop! kool eslop!) [esclop n.]

(UK Und.) a warning cry of ‘look police!’.

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[UK]H. Mayhew Great World of London I 6: Master Whelkey will answer perhaps, ‘But kooltheesilop’ (look at the police); kool him (look at him) Curly!
[UK](con. 1840s–50s) H. Mayhew London Labour and London Poor I 17/1: A scout can give quick notice of the approach of the police [...] the cry is given of ‘Namous’ or ‘Kool Eslop’.
[UK]J. Diprose London Life 43: [as cit. 1856].