Top Definition
A baby whose parent is a prostitute and does not know who the other parent or both parents is/are. Fused from the words prostitute and baby.
Jacob: Who's your father?
Justine: I don't know, my moms a prostitute.
Josh: So you're a prostababy?
Justine: Yes faggot.
by Did I ask you? April 16, 2010

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