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noun: When a person attempts to be sarcastic, but the other person believes their words to be serious.

a: OMG I weigh 115, I'm an effing elephant!

b: Yes we might as well call you Dumbo and give you wings.

a: What do you mean?

b: Chillax! Don't be realcastic.
by prettydangflyy January 05, 2008
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