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One of the many degrees of mood murder. If one is not intentionally trying to ruin someone's mood but manages to do so anyway with a stupid remark or a lame joke he is said to have committed involuntary moodslaughter.
Guy #1: Dude that dig about vegetarians was mood murder. you know my girlfriend is vegan.....

Guy #2: I had no idea she was sitting there. It was involuntary moodslaughter at best.......
by reddKarun July 22, 2010
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