Top Definition
When someone kills and then uses an insanity defence.
Mayuko: Did you hear about the Tampa mom who shot her teenage kids for being mouthy?
Phil: What the?
Mayuko: Yeah she said that she snapped but it turns out she had it all planned.
Phil: Good luck using the premedicated murder defence.

Noriko: That Greyhound bus beheading guy was totally crazy don't you think?
Paul: Yeah, premedicated murder for sure.
by ocius1 February 05, 2011

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