Any object or situation that is intensely disliked as a whole.
There is a subtle difference between using "hated" in this way, and in the traditional
use "it is hated (by many)". In this
case, "Hated" is used
like the word "Hateful".
It's often used by itself, or as a one-word reply.
"I saw a cockroach run up the
wall! Hated."
"I got pulled over today...."
"Ahhh..
Cops. Hated." (The person is sympathizing with the one who got pulled over by saying how much he hates
cops too.)