When you spin in a circle and fire your machine gun constantly in hopes that you kill someone.
SweetHeavyD's tornado attack only killed his team mates and no one else.
A grenade launcher, either in standalone or attachment form.
DK Chevy tried to pro stick me, but instead, I pro sticked him.
In video games, where you get 3 kills with a single weapon fire or explosion.
I got a jack tripler by throwing a grenade down that hallway