"Dad gummit" is a very simple thing to explain.
First, you use reverse dyslexia for the first two letters in each term.
"Gud dammit".
Then one simply fixes the first term by changing one vowel.
"God dammit".
And there you have it.
What somebody might say who is responding to news that makes them gnash and foam at the mouth so much that they completely forget they did not have their dentures in, therefore causing a strange inflammation of the gums.
Madgummit, you done got me fair and square there, Musky!
Dad-gummit this should not be such a trivial meaning! It's original as the idea of religion. It simply means "I sure as hell did not want "this" immediate outcome." Shit! I mean, dad-gummit!
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.