dihydrogen monoxide 

Evidently really baaaad stuff.

In today's lab, you're gonna be working with dihydrogen monoxide. Now in large amounts, it could cause suffocation and death. If the subtance is heated, it could cause severe burns. Cold versions of this substance can also cause frostbite. Handle this lab with extreme caution, please.

dihydrogen monoxide by Ichigo69 November 1, 2009

Monoxide 

A popular YouTube vlogger/"shooter". Has had many feuds with YouTuber's such as reymon14, dadirrtywhyteboi, Chriswcw5, rvdtito4life, and most recently SarcasticVenom.

YouTuber: Dude! Monoxide is owning Rob!!
Regular Person: Who the FUCK is Monoxide?

Monoxide by bWo4life12 January 24, 2009

Dihydrogen Monoxide 

Sometimes shortened to DHMO or {H2O], it is the molecular name for water. For more information about chemistry, go to a science website. For more information about water, visit your local water bottle

NOTE: Being such a rare term, it is commonly used by 4Chan to prank people. A common prank is listed below.

Did you know that there is a substance called Dihydrogen Monoxide that causes a lot of death and disturbance every second? When you breathe DHMO, you die. But Big Pharma doesn't want you to know! Dihydrogen Monoxide is present in every single vaccine, and 100% of Autistic children have drunk it. Big Pharma has put DHMO in all your medicines, and even Homeopathy cannot exist without it. If you drink too much, you die. But yet, you are given DHMO at the doctor's office when you ask for water. SMH my head Big Pharma will never learn

Dihydrogen Monoxide by swntimentoffreedom May 21, 2019

carbon monoxide 

A molecule consisting of one carbon and one oxygen atom. Commonly produced when a flame does not have enough oxygen to combust completely.

I could really smell the carbon monoxide coming off that smothered candle

carbon monoxide by the sneaky pigeon March 16, 2017

dihydroxy monoxide

1. H2O or water (its a joke)

dihydroxy = 2 Hydrogen
monoxide = 1 oxygen

dihydroxy monoxide by BurningBunny or HelloWorld of CoughSyrup October 6, 2004

Carbon monoxide 

What somebody is going to breathe instead of oxygen if you stick their head next to an exhaust pipe intentionally.

If a guy has a knee on his neck while his head is right near an exhaust pipe of a car, he has nothing to take in but car exhaust. Just like somebody sitting in a garage with the grage door closed and a car running. Death is from both lack of oxygen and carbon monoxide.

Carbon monoxide by Solid Mantis April 14, 2021

Trump Monoxide 

Toxic or blasphemous talks or rumors about the Trumps and their diehard morally bankrupt donors that residents living in the vicinity of Mar-a-Lago are sick of hearing every other day, which have negatively impacted their property prices or businesses in their once-sunshine state.

Floridian authorities are clueless how to remove all trump monoxide that is lingering over their state following scores of complaints from even angry patriots-neighbors and property agents, who’ve threatened to stage days-long protests outside the FBI-searched resort if the Hoarder in Chief refused to move out.

Trump Monoxide by Fasters June 22, 2023