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A baseball sized stone (usually granite) which is used to fend off the unwelcome spiritual advances of an intrusive, fanatical religious proselytizer. They are typically blessed with an incantation, and then carefully placed within the cranium of the offending believer at a high velocity, where the incantation will hopefully dissolve and they will get the message. It is considered bad form to use prayer rocks unless your attacker has begun to threaten you with prayer.
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