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A dull and serious person with a limited sense of humour who always spoils jokes or light conversation by pointing out any flaw or exception
Person 1: "Damn chip packets only fill up halfway it's so unfair"
Person 2: "Yea mate they're half air what are we paying for?"
Person 3: "Actually, the slight inflation of the potato chip bag with nitrogen serves to prevent product spoilage or damage during transport. Furthermore, the mere volume of a chip bag should not give you an indication of how many chips are inside, but rather the mass of the product which is clearly labelled."
Person 1: "ok Reverend Killjoy"
by emcee-sdOG January 25, 2015
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