What is a pile bunker

I google searched it and nothing was found @ answers.com for one. This was just a random question nagging me but I keep seeing in games weapons that say "pile bunker" in which you have to get really close to score a hit. I guess it's like a stake being drove into the body.

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I believe it may be a bunker built of stacked logs or concrete blocks.
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It is a bunker composed of a pile of precast concrete blocks, designed to be easily assembled on the front lines to bolster a trench line.
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A pile bunker, as a weapon, is a weapon worn on the forearm, and is used to inhance the strength and damage of one's own punch in various ways; such as just merriely adding weight behind the punch, to adding spikes to impale, to actually being mechanical, etc etc
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The most consistent definition I could find, at least as a weapon, is that it's a sort of stake attached to a hydraulic pumping mechanism (like a piston I guess), which is used to forcefully pierce through tough materials. I haven't seen any sign of it in real life, and don't know why it's called a "pilebunker", but variants of it are apparently mildly popular in video games as weapons of the "excessively awesome" variety, particularly games centered around giant robots and other durable combatants.