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Constantly updating your facebook status to reflect your pregnancy, up to and including going into labour.
Ew, did you see Rhéa totally updating her facebirth?
by chet_woolery January 04, 2009
When one discovers their friend, who they didn't know was pregnant, just had a baby and posted it on Facebook.
Emily just had a Facebirth. I didn't even know she was pregnant.
by Max Simon Simmons Lovelace Ho August 06, 2013