bob: hey man what the hell are you doing with that large backpack?  matt: i'm headed down to the dropzone to do some skydiving
also known as dz, this is a place you go to jump out of an aircraft, land, and repeat
"bob: hey man what the hell are you doing with that large backpack?  matt: i'm headed down to the dropzone to do some skydiving" What is the definition of "dropzone"?