Top Definition
A 2000baby is a person who was born in the year 2000 A.D or after. Anyone who's birthday preceding January 1st 2000 A.D is not considered a 2000baby.
Tim was born on August 5th, 2000. He will the be first 2000baby I have ever met!

John, is your son a 2000 baby or was he born in '99?
by JC84MT December 15, 2010
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