Personally, I think it means mama had a baby and then a few more and then they grew and mama became slightly more and more insane every day until her head popped right off!
OK, maybe, I am ever so slightly exaggerating.
My head is still attached.
Some days my kids look at me like I have gone mad. Right in the dag-gone middle of my mega mom melt down the corners of their mouth’s curl just enough for me to notice the gratification they consume over my monster-size justified fit.
So, waaaaay back when, so far back the internet does not even have the answer…. Small children were witness to their mom’s head popping off during a totally justified meltdown.
And that my friends is how that child’s favorite chant came to be.
Or maybe not but I think it fits and is reasonable so I am just gonna roll with it.