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Oman is an expression used widely among TMC (Technical Minecraft) and it has the same meaning as oh man.
"The quarry broke"

"Oman"
Oman by Duckie duck May 7, 2021
Related Words
A condition where a person sleeps accidentally due to several factors such as tired, exhausted after mastrubating, etc.
sorry i missed the game last night, i ojaned
Ojaned by Dr.Prof.Master.Sgt ojan February 10, 2020

omae wa mou shindeiru 

Something from the anime/manga series ‘Fist of the North Star’, meaning ‘you are already dead.’ And then the person it has been said to dies. If you hear this said, it is completely unacceptable to not say ‘Nani?!?!?’.
Random person: omae wa mou shindeiru
Me: *appears behind them* NANI?!?!?!?!
An alternate version of 'OMG'
Pronounced 'oh-am-nay-gee!', it's a short for 'Oh My Non-Existent God,' instead of the usual 'Oh My God!'
If you don't believe in God, use this instead of OMG.
Believer: Did you know, my friend crossed the streets yesterday and he wasn't hurt AT ALL!

Nonbeliever: OMNEG!
OMNEG by Taniaetc March 22, 2011
The element 118, previously known as eka-radon (eka being sanskrit for one) or ununoctium (one one eight element) was renamed in 2016 after the nuclear physicist Yuri Oganessian. It is the heavier analogue of Radon, thus, it is a noble gas. However, it is theorized that it would be a solid at the standard atmospheric pressure. Like its lighter analogues Radon and Xenon, it would be relatively easy (compared to Helium and Neon) to bond Oganesson to things like halogens and alkali metals.

Oganesson, in its most stable (known) form, has 118 protons, 176 neutrons, and 118 electrons. It is considered by some to be the last of the Periodic Table of Elements, however scientists are currently working on synthesis of elements 119, 120, 121, and 122.
Guy 1: Wow, thanks to Oganesson, the periodic table is finally complete!
Guy 2: But, scientists in Germany claim to have discovered Unbinilium. If their claims can be verified by another team, then that will be the start of a whole new row!
Guy 1: Ow, right in the OCD...
oganesson by Noobly20932 February 4, 2019

Omae wa mou shindeiru 

This is only used in the highest profiles of the highest edgy meme lords. it can be used to absolutely destroy an opponent in battle. Only the best can use it. It means “you are already dead” but will instantly kill your opponent in an anime battle.
Opponent: “ fight me
You: “omae wa mou shindeiru”
Opponent: dies
You: naruto run away