Someone who plays an objective-based game mode in a shooter video game for the sole purpose of getting a high kill count to pad one's stats while completely ignoring the objective. Heavily frowned upon and borderline cheating. Kill farmers are not legit.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

One who plays a kill-objective based game that, instead of fighting enemies, waits while others weaken them before rushing in and claiming the kill prize with no effort.