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2.
A comeback without much reason behind it besides random shock/bewilderment value. It is similar in usage to "You're Face!" or other random things that can be said as a comeback.

NOTE: This comeback is however tricky to use as saying it to a person who IS indeed adopted would be in very bad taste.

NOTE: This term is best used to friends or people you know are not adopted.
Person #1: "I don't understand why you would do that. That has to be the stupidest thing I have ever heard of a person doing!"

Person #2: "Shut up, you're adopted!"

Person #1: I am adopted, you monster!

Person #1: Oh! Well... I... uh...
by TheLightDreamer June 27, 2012
 
1.
one of the funniest comebacks ever.
sort of like "your mom" or "your face"

but be sure to not actually say it an
adopted kid. they might take offense.
Lexi: That's a really heinous picture of you, Emily.
Emily: SHUT UP LEXI. YOU'RE ADOPTED.
by Super Ninja January 07, 2008