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1.
A response to a question of the practicality of something which is clearly overkill, it implies that the one who uses the phrase to answer the question of 'why' knows full well that it is overkill, and overkilling for overkill's sake was their intent.

(The examples probably describe it better)
Q: Why would you build an aircraft carrier that flies?
A: Because fuck you, that's why

Q: Why would you need a 6-core CPU?
A: Because fuck you, that's why

Q: Why would you make an automatic grenade launcher?
A: Because fuck you, that's why
by gnerd October 11, 2011