AoE2 also uses this term extensively especially within the context of ranger infantry. A clump of forty arbs will chew through the armor of even intended counters (like knights).
One of the more interesting applications of this term I've seen is in TW WH2 (Total War: Warhammer 2) where a faction like Vampire Counts gets a lot of utility out of death-balling even trash tier units like skeleton warriors - so that opponent infantry and cavalry gets mired in the mass of unit collisions to make it easier to get a clean spell targeting off. I think the term is pretty well established at this point as evidenced by the derivative usages that are now popping up.
One of the more interesting applications of this term I've seen is in TW WH2 (Total War: Warhammer 2) where a faction like Vampire Counts gets a lot of utility out of death-balling even trash tier units like skeleton warriors - so that opponent infantry and cavalry gets mired in the mass of unit collisions to make it easier to get a clean spell targeting off. I think the term is pretty well established at this point as evidenced by the derivative usages that are now popping up.