killoff
A high energy dance move performed when krumpin, usually a finishing move when getting buck.
Tighteyes got buck last night man, you missed his crazy killoff.
killoff
A deliberately caused, carefully engineered mass dieoff, whether of humans or of other animals. A dieoff sounds nicer because it "just happens," whereas a "killoff" requires a murderer or murderers to bring it about.
The authoritarian dictator planned and plotted the killoff over many decades and was now reaping the fruits of victory, worldwide mass genocide or omnicide, more politely termed depopulation.