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1.
The particularly insatiable thirst you have when you are hungover.

From German nach ('after') + Durst ('thirst')
After a few drinks too many:
Friend 1: 'Mate, you have been hitting the water hard for the last half hour'
Friend 2: 'I know, need to avoid having Nachdurst in the morning.'
by Germanist June 08, 2013