I've heard Joe Rogan say this on his podcasts when he's talking about fighters. Merck isa huge pharmaceutical corporation. Is he trying to say that one fighter would beat the other so badly that he'd cause brain damage, requiring the man to take some sort of medication for the rest of his life? If so it seems to be an awfully long and awkward way of going about saying it! Could somebody fill me in on what he means when he says that and what s the origin of using "Merck" or "mercked" in that context, i.e. who started using it in that way first? Thank you in advance!