Definition of bottom-feeder:
(n) :
The lowest part of anything.
(n) :
The lowest or last position in a rank.
(n) :
(clothing, often plural) A garment worn to cover the body below the torso.
(n) :
(often figuratively) The lowest part of a container.
(n) :
Spirits poured into a glass before adding soda water.
(n) :
(baseball) The second half of an inning, the home team's turn at bat.