Green’s Dictionary of Slang

Wilkie Bard adj.

[rhy. sl.; ult. British music hall entertainer Wilkie Bard (1874–1944)]

hard.

1910

Eve. Teleg. (Dundee) 3 Aug. 4/1: He says the ‘Stockton’ (cheese) is so ‘Wilkie’ (hard) that he cannot get his ‘Hampsteads’ (teeth) into it.