Babies that are the result of union between a black and a white person because black + white = gray.
My parents expressly explained to me why it would be socially-economically complicated to bring home a gray baby and in the process forbid me from hiring any more homeless schizos to work for their private company.
Gray baby syndrome (also termed Gray or Grey syndrome) is a non-rare but serious side effect of white women having unprotected sex with black males finding themselves single and alone 9 months later. Also see Bastard.
Tiffany meets Tyrone at Club Krunk on a Saturday evening. A few drinks later she finds her self thinking about Tyrone's possible large "package". Tyrone then convinces Tiffany to let him come back back to her place where they proceed to have unprotected sex. Tiffany wakes up the next morning to see no signs of Tyrone. ::Flash to 9 months later:: Tiffany finds herself in the local hospital holding her little Gray Baby.