What you say when your surprised or in disbelief. A substitute for Oh MY GOD!
Person 1: Micheal Jackson died yesterday.

Person2: I'M A PIZZA!
by Shrugu December 22, 2009
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A quote from a movie called "die hard", meaning: obviously!
Usually used in phone conversations.
Supervisor: Attention, whoever you are. This channel is reserved for emergency calls only...
Detective John McClane: No fucking shit, lady! Do I sound like I'm ordering a pizza?
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