contango day

Etymology
contango + day

Noun

 * 1)  The second day before payment of a contango debt is due.
 * 2) * 1968, P. G. Wodehouse, 'Do Butlers Burgle Banks?', Everyman, London: 2005, p 156.
 * 'Let's see, when is next contango day?' asked Ferdie.