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."

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.