Spanner job

UK: Used to describe the fifty pence piece due to its seven sided design and its resembelence to a nut*.

*As in nut and bolt.

Customer: Barman! can I have change for the cig machine.
Barman: How much do y' need?
Customer: A couple of spanner jobs should sort it, ta!

by Blue Cawdrey November 21, 2004