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Magnum Oopus 

A person's biggest screwup.
Knocking down all the shelving in the parts department was my Magnum Oopus. What a mess.
Magnum Oopus by Hmd107 December 21, 2020
Related Words
Like bill and teds bogus adventure, the average day in the life of Ryan and Sam
"dude did you hear about their Oopus day yesterday? Steve ended up in Stephanie's panties and they beat a goat at monopoly"
Oopus by Ding Chaveze August 17, 2011
It’s like oops
but instead it’s oopus
Also oopusite
The oopusite of yes is no
Oopus I didn’t know if an iguana was a fish or a meat
A way of saying "oops" but in a weirder fashion.
This is usually used in text, but can be used in person if one already knows the meaning of "oopus."
Person 1: "Hey what'cha wanna do tomorrow night."
Person 2: "You😏"
Person 2: "Oopus!"
Person 1: "uh.... nevermind, man."

Magnum Oopsus 

A screw up so big, that it'll be the only thing your legacy will be remembered for.
Elon Musk's destruction of twitter was his Magnum Oopsus
Magnum Oopsus by MrLint April 7, 2023
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.
Nutshot by Uberflaven March 1, 2009
Word of the Day on June 26, 2026