As sick as a plane to Lourdes

exp.

Heard in Waterford

A very bad hangover, derived from the historical practice of the sick going to Lourdes in France to be divinely healed, the scene of a religious apparition.

In use

I was well buckled last night and I'm as sick as a plane to Lourdes today

Posh English

I was thoroughly plastered last evening and today I suffer a most punishing constitution.