Leftover dense material. Used to describe industrial sludge. Another informal usage refers to the last few centimetres of coffee at the bottom of the pot.
Although it most commonly refers to the beer at the tail-end of a beer, it can also refer to someone's leftovers, or sloppy seconds. This also applies to sexual 'sloppy-seconds' by which it refers to someone that the subject has already had sexual intercourse with.
Dude, like I know you think she's hot, but you'd be doing Dan's sloppy seconds... It's his dregs man! HIS DREGS!
1. A rare, unique slang meaning "the worst part(s)" or "dirty/grimey".
2. "Fuck."
The word's original origin comes from wine brewers. "Dregs" or "lees" were the words applied to the wine residue during the aging process. "Dregs" also comes from the grammatical base of the word "dark".