The pleasant feeling of still being drunk when you wake up the next day after going to bed/passing out after a night of drinking. Far better than the alternative (cf hungover)
Woke up pleasantly surprised after last night's shenanigans to find I was leftover drunk rather than nursing a horrific hangover.
Leftover drunk is a special kind of drunk. You wake up, the day just dawning. After last night, you expected to be spending a miserable day in bed/on the couch/under a highway overpass, but instead you feel great. Music sounds and food tastes even better than you remember. You feel like you've cheated Death itself.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. PenguinBooks,1992. p. 38)