Top Definition
A Block Baby is the child of a woman that doesn't know who the father of the baby is. In other words it could be anyone on the block. Therefore, it also insinuates she's a hoe.
Person 1: Did you see her baby? He's so cute.

Person 2: Yea. Too bad he's a block baby. That baby mama's a hoe.
by Check Mate June 13, 2007
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