Green’s Dictionary of Slang

conk v.1

[conk n.1 (1); one ‘puts one’s nose in’]

(UK Und.) to inform.

Show quotations
[Aus]Vaux Vocab. of the Flash Lang. in McLachlan (1964) 278: To wear it upon a person, (meaning to wear a nose, or a conk,) is synonymous with nosing, conking, splitting, or coming it, and is merely one of those fanciful variations so much admired by flash people.