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Noun denoting the offspring conceived by a married woman while her husband is away for a period of months or years; e.g., at war or in the joint.
Moe: I don't understand how my wife had a baby a month ago. I mean, I'd been away for two years!

Joe: Well, Moe, that kid's a grudgebaby. Somebody had it in for you.
by Ernest Peabody August 01, 2006
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It's an asian kid who hides in your attic. And wears mascara. And is albiano.
Dude, fuck why are you in my house you grudge baby?

You fucking pail you look like a grudge baby.
by thats what she said! May 08, 2007
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