Top Definition
When the volume of shit is so tremendous, your butt experiences labor pains. Men experience no envy about babies, contrary to what some women think, because they poop like norse gods.
UUUH---UUUUUNNNGH!!!! Goddamn motherfucker, I just done given birth to a shitbaby! It's a sinking, stinking brown boy! Time to go for a swim thar, junior!
by Yabigdumi May 11, 2006

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A shit so big and/or painful, it feels like you have given birth out of your butthole.
Will you bring me some ice chips and baby wipes? I swear I just had a shit baby.
by kracken4rmthesea January 02, 2010

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Although it happens rarely, it is possible for a woman to become pregnant from anal sex if the semen leaks out of her asshole and into her cunt -- the term for a child born as such is "shitbaby."
"You're stupid!"
"Yeah, well you're a shitbaby."
by the letter d May 28, 2007

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a guy who leads you on in a "relationship", and then doesn't have the balls to dump you when its over, but uses made up lame excuses instead of saying "its just not working for me any more", basically treats you like shit and can't end it like a man
Shit Baby told me he heard some things I had said about him, and that was why he wouldn't answer my calls or texts.
by flufferbot March 27, 2013

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A shit-baby occurs when you get backed up for days. Let's just say that sometimes people need some fiber/activia/laxative etc. When you get backed up for days the belly starts to protrude and people my think you are pregnant because of the rounded stomach.
Girl 1: Hey girl are you pregnant?
Girl 2: Nah, I just haven't pooped for 3 weeks.
Girl 1: Oh I see. You have a shit-baby.
Girl 2: Well yes I do.
by McJoselyn November 02, 2008

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-noun
The rare and unfortunate occurrence of a bowel movement that crests the leg openings AND rear band of an infant or toddler's diaper, resulting in yellow, curdy staining of a substantial area of the child and his/her clothing (and often furniture, parents, and household pets).

See also shitback and shitleg
I'd better just give him a bath and throw out his clothes - he's a complete shitbaby.
by ochawan August 19, 2008

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A baby that is born alive despite no symptoms of pregnancy and/or survived abortion attempts while in the womb.
Jen: Either my stomach is seriously acting up or I am about to have a shit baby.

Chad: That's gross.

Jen: Seriously, it's going to be the size of a child. I have to go.
by megapixel2000 May 21, 2009

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