More Vietnam jargon. Originally refering to an alley ball or stickball game played in most neighborhoods. Used by some military (usually in betting)to describe how the body of someone caught in the "Free Fire Zone" would travel when they were hit by the snipers or shots from the perimeter
look!... man, look out there at 11o'clock... what is that dumb ass doing in there? can't he fucking read? Fuck`em, cap`em. Hold on man! Don't shoot yet - Wait a fucking minute... I'm calling "First Bounce or Fly!"... I got $10. that says this one's gonna be a first bounce...anyone `wanna get down with $10. on a fly ball?? Ok. You're on. Alright man, blast the motherfucker.