When it is so cold outside that even the coldest and meanest of evil witches develope a nipple errection that is so hard and pointed that you could cut glass with it or poke someone's eye out with it

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)