When a person is ejected from a car during a wreck and walks away from it after flying like a torpedo through the air
Did you hear about Bruce and he pulled the human torpedo
When a person goes flying out of a car that has just been hit by and other moving car
Did you see that human torpedo land in the ditch earlier
When a person playing basketball shoots up to the rim in a complete pencil like shape with the ball in two hands above their head with their arms fully extended. The person does not change position in mid air until the dunk is completed and both feet have landed on the ground. The Human Torpedo can be used to achieve a "Master Eng" which is a different term.
"He just did a human torpedo!"