Top Definition
The NEW version of 'Your Mom!'. Because everyone knows that saying is getting old. So come up with something fresher like 'Your Unborn Brother!' It's totally random and will leave your friends confused and awestruck from you witty originality.
Q: What's the answer to #9?
A: Your Unborn Brother!
Q: Who's the new choir teacher?
A: Your Unborn Brother!
by H Nicole M January 13, 2009
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