Leftover Drunk

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.

backbrain

The repository of knowledge one retains but doesn't realize one has until such knowledge is necessary in a given situation (e.g. recalling the name/face of an old acquaintance/friend/girlfriend)

"I was walking to work and some guy asked me where I went to school; I thought he was a creep until my backbrain kicked in and I realized we lived on the same floor freshman year."

"I couldn't figure out why she slapped me until my backbrain kicked in and I remembered that I slept with her best friend a few years back."