Similar to the expression “in your dreams” which is a sarcastic way of responding to - or interrupting – someone who is busy telling you about their master plan and all the unrealistically fantastic things they think will happen to them. Only in this version additional emphasis is placed on the boldness and arrogance of their claims.

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)