Green’s Dictionary of Slang

jobber knot n.

[? mis-reading of colloq. jobbernowl, a stupid person, ult. f. SE noll, the crown of the head]

a tall man.

Show quotations
[UK]Swell’s Night Guide 123/1: Jobber Knot, a tall stupid fellow.
[UK]Flash Dict. in Sinks of London Laid Open.