Top Definition
someone who is emotionally emancipated. different than bastard. emotional orphan. a birthdult has parents, but is completely independent/emotionally unattached from them.
Person A: My mom's coming to visit. I haven't seen her in 3 years.
Person B: Weird...I don't think of you as someone who has parents. You're a birthdult.
by Borah June 16, 2008

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