any substance that will bring you back to life even if you are an inch from death. ( the term death in this context is liberally used in reference to a hangover or other state of sickness or depravity). could be any thing from Loratabs and cocaine to Robitussin and liquor.
John: hey Bill your looking rough, and we have a long day, are you OK?
Bill: no man, rough night, i feel like dying
John: don't worry take a couple of these TABS and youll be good to go, its that unicorn blood i swear.
Bill: (gulp) man i feel great... where the broads at i need some shots... that unicorn blood has me on another level