A deathstreak perk in Modern Warfare 2 that boosts health at spawn after four deaths in a row. Used by noobs and those who just want to be generly annoying.
Euan: Man I hate painkiller
Jack: Yeah, y'know what im gonna do?
Jack: Im gonna go to Infinity Ward's HQ, give all the staff penicillin, then spray my RPD and see how long they survive!