chunk boy

Chiefly military, I guess.
For a soldier who is carrying high-risk equipment that can explode even with the smallest distrubance, thus exploding and blowing him to pieces (chunks).

“White magnesium flares. Mandatory issue for all night ops, even stealth runs like this... But they’re not too stable, if
you know what I mean. All it takes is one bullet in that bag, even something small like a .22, and boom! Chunk boy. If you know what I mean.” He chuckled...