On: In 1957, Five Men Agreed to Stand Under an Explodi...

[Tuna-Fish]

Sorry to disappoint, but it's been in wide use for half a century. BAC coined it to market their Rapier missile which was accurate enough to not need a large fragmentation warhead, and it spread out from there.

[PhasmaFelis → Tuna-Fish]

I wouldn't say "wide use". Google has only 18,000 total hits for the term, and most of those seems to be false positives (e.g. "hit tile").

[Zancarius → PhasmaFelis]

Certainly not in the DoJ's R&D engineering teams, AFAIK. See my post above. That's not to say it's a more common colloquialism in commonwealth countries.