I first heard this word in 1991. My friend Katie said it in seventh grade. I believe it is a euphemism for the s word (you know, 'poop') - I don't know if I'm allowed to print it here. Anyway, I think it's cute and have only heard it once since - from a co-worker named Christina who thought she made it up.
Upon realizing you don't have enough change for pop/upon realizing you set off your car alarm... "Oh poopydust!" Yeah, it's usually said alone. Giggling usually ensues.
My Mom would say this all the time when I was young (I am 31 now).
I second the notion that it is slang for "Oh S*#T", but (in my house) it was used in a "laid back" context.
(after stuffing you face at Thanksgiving dinner you unzip your pants and slide down on the couch)
"Ahh poopydust"
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.
A "human" that spends so much time playing video games that their posture is level nerd neck. Everytime anyone goes tryhard they hunch down and their neck gets longer there fore a nerd neck is always hunched down cause they're always going try hard. In other words a nerd neck is a try hard, since their neck is 100% longer than the average human being due to playing too many video games and taking them serious, nerd necks are not even considered human anymore but something more sad. Nerd necks are often found on fortnite, their natural habitat usually being tilted towers.