A phrase used by adding the term ROFL (rolling on floor laughing) and copter to create the term roflcopter. Soi soi soi is a sounds given to this "roflcopter" "machine"
Roflcopter-on-your-face. A porno of a T1000 terminator who fucks a chick and instead of jizzing when he cums he pulls out and his dick morphs into helicopter blades and chops her up. Then the movie turns kinda Army of Darkness, but the dude kills zombies with his Roflcopter, instead of a chainsaw attached to his arm.