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1.
The act of ruining someones good mood by introducing bad news or behaving like a douche-bag.
D-Bag: "This steak sucks. Why are we eating here? I think McDs has better food."

Dude: "Shut the F*** up! It's my F*** Birthday! Seriously you are shitting in my Cheerios!"
by Burgerpickle September 02, 2010