Designated Drunk… I’m not even going to bother with the full-out “dic vers”
These are not different definitions, these are the steps, performed to the very end.
1st:
Responsible partiers choose a Designated Driver to drive during a night of debauchery.
2nd:
The Designated Drunk is chosen by the Driver.
3rd:
The Designated Drunk assumes responsibility for all drink offers given to the Driver.
4th:
The Designated Drunk takes all offers of toasts, shots, and drinking competitions in place of the Driver.
(I have ACTUALLY been this person for the night. OMG!)