i got an empty cup, pour me some more

Though attested in the figurative sense to mean unfinished business since the nineteenth century and associated with the deleterious effects of too much drink until the turn of the century and the end of the Victorian-era, it is most likely a folk etymology, a backronym popularised by George Orwell’s 1933 Down and Out in Paris and London that the term hangover came from the Two Penny Hangover—the reported practise of draping the homeless or inmates of workhouses over a length of rope for a night’s accommodations. More comfortable that sitting up for the night or on resting on the cold stone floor—also maximising the number of lodgers per square metre—but the rope was promptly severed at five in the morning with the unfortunates tumbling and sent on their way. Language check and illustration both bookendings from Messy Nessy’s latest peripatetic internet journeys—with a lot more to discover at the link above.