More than what is needed. In gross excess of what is reasonably expected. An excess of something beyond what is required or suitable for a given purpose.
Originally applied to nuclear weaponry.
"So, Bob, you ready to tear down that fence?" "Yeah, Chuck, the plastic explosives are all wired up!"
A 40-megaton nuke is overkill for destroying a farmhouse.
An Opteron 246 32-way server is overkill for typing up a paper.
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