When a girl is attractive or hot, meaning you would have sex with her. Comes from the legal term "good law" usually when a case law has not been overruled by a higher or same level court and is still binding precedent.
A: Would you hit that? (referring to a girl)
B: Yea, she's good law!
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Best exemplified by Sheriff Roscoe P. Coltrane, until they screwed him out of his pension!
Random Citizen: Roscoe was a good law man. That was, until they voted to not award him his pension.