Last night Brandy come up in the trailer saying how she had a baby and it was mine and I knowed she ain't let me take a smell in at least nine months so I tell her she can just shit and fall back in it for all I care.
A response trivialising someone's description of what they plan to do, when the listener finds it extravagant or believes it won't actually be carried out or won't succeed.
Person A: My sister is so upset with her local councilman that she's starting a petition to have him recalled.
Person B: Yeah, she's gonna shit and fall backwards in it.
Southern Origin. Something you may hear Old Folks say when something doesn’t go right. It is comparing your actions and the situation to playing with your own feces, because they are both unproductive.
Granny: We have to go straight!
Me: Yeah, but this lane is turning only! We have to turn!
Granny: Well I’ll be shit and dabbled in it!