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A blunt and useless tool.

Ideal insult for the stupid (and jocks), as they will be shaking their heads and overworking their 2-cell brain to figure out why everyone is laughing at them.
Guy: "Dude, you're a glass hammer"
*onlookers laugh*
Jock: *puzzled expression* "Huh?"
by MortalWombat April 28, 2010
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A word to describe something that is as powerful as it is fragile.
Man is a glass hammer, powerful beyond compare but fleshy and destructible.
by Saecryd August 23, 2008
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