dregs

noun[usually plural]2

1. •
   The sediment settled at the bottom of a liquid; the lees in a container of unfiltered wine.

   • And vital virtue infused, and vital warmth / Throughout the fluid mass; but downward purged / The black tartareous cold infernal dregs — 1667
2. •
   (figurative) The worst and lowest part of something.

   • I sat through the dregs of a long hectic evening.