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1.
One who constantly tries to add ingredients and tells someone what and how to cook something when someone is preparing food.
Mom: "Okay, i'm making dinner."

Kid 1: "No, no, no, you are making it all wrong, you need to add ketchup."

Mom: "Oh I think i can do this myself sweety."

Kid 1: "Ugh!" *adds all THEIR favorite things.

Kid 2: "OMG, you are such a backseat chef!"
by LOL~WUT June 06, 2011
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