Top Definition
when a chick gets buttsex and becomes pregnant, she craps the baby out her butt. hence the baby is usualy retarded or gay.
when my girlfriend had a buttbirth the child was covered in crap.
by mr tigerplop April 20, 2009
One who has an appearance that should not be revealed in public.
D'jerome: dude, why is that girl so rachet?
Mike: Butt Birth man, Butt Birth...
by SirNinjaStone June 21, 2016
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