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When you ruin somebody's day by telling them some really bad news or make them do something really horrible, usually the receiving person is in a very good mood before said action happened.
person 1: I just won a scratch off ticket.
person 2: Your dog just got hit by a car.
person 1: Man, you just shit in my cherrios!
by ldfkuyg93585uvdofijgh566 October 13, 2007

Words related to shit in my cherrios

bad news cereal cherrios horrible shit