From the movie Pulp Fiction, one of the most feared characters stated his henchmen would "go medieval on yo' ass", which basically was a way of saying his men would click out on the men being threatened. To go medieval means to become savagely violent without restraint, similar to how we imagine those in the savage, unrestrained medieval times would respond to someone who had done them wrong.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

beat/beating the living hell out of somebody, either physically, or mentally

also known as "kick the shit out of"