Military term refering to the unidentifiable mass of blood and bone fragmetns left over when a fragmentation gernade in thrown into an occupied room / bunked / cave made from a strong material such as concrete or rock. The shrapnel from the gernade doesn't have the power to pierce the walls, but too much momentum to stop. So it simply bounces around in the room for a while until all occupants are reduced to small bits resembling chunky style chip salsa.
What to do when you got a bunker full of diehard? Toss a frag in and try not to step in the chunky salsa.