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1. A prison inmate who, despite having no legal education, studies law and argues for the rights of other inmates.

2. A lawyer who throws out any and all arguments, even blatantly wrong ones, for his client.
His lawyer said the defendant must have been the victim of a CIA mind-control experiment -- now that was a jailhouse lawyer argument.
by O.W. Holmes Jr., III January 21, 2009
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A prisoner who has not practice law or had any legal training, but is disposed to a lengthy discussion of his legal rights and those of other inmates
He's always has something to complain about. He's such a jailhouse lawyer.
by The Return of Light Joker June 22, 2009
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