sling your hook leave; go away. British informal

☞ Sling your hook appears in a slang dictionary of 1874, where it is defined as 'a polite invitation to move on'. The underlying allusion may be to the raising of a ship's anchor and stowing it in a sling before setting sail.

2012Scribblings Jottings So it seems that when the city of Liverpool told Warren to sling his hook and not come back he mistook a city's jeers for cheers.