fleabag

noun

Etymology: From flea + bag.

1. A bed or sleeping bag.
2. A place of shabby lodging, particularly a filthy hotel or run-down apartment.

   “‘[E]veryone knows that Charlie […] takes little girls up to a room in that horrible flea-bag; but he's a respectable man just the same.’”

   “[W]hat Olin could do was take himself on out of the agent's office at a rapid hike and thank God all the way back to the fleabag where he worked that Mike Enslin had decided not to sue either the hotel or Olin for negligence.”

3. An unkempt mammal.

   “He's become a real fleabag recently. Time for a bath!”

4. A mammal whom the speaker dislikes.

   “Get out of the way, you fleabag!”