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...