Hydro Slime 

A big blue blob with cute little facial expressions and horns that jumps everywhere

What's the hydro slime doing to Hu tao?
1000 primogems for a slime seed?

Hydro Slime by Genshinfax24 April 21, 2022

Hydro Dump 

A purely liquid and sometimes greasy diarrhea-like excretion. Usually uncontrallably released while farting.

Anonymous Soldier 1: Guys, I need to eat something before we go drinking, or else I'm gunna have to take a hydro dump at the end of the night.
Anonymous Soldier 2: Hurry up and grab that loaf of bread on the counter!

Hydro Dump by Josh Sabourin June 7, 2007

Hydro-Lithium-Demerol-Amal-Nitrate Uranium Scrupulator 

This high-power laser is used by a CPS (see Carbon Proton Synthesiser) to imprint smiley faces on the protons of Carbon atoms. If this laser is aimed into the night sky, the dot can be seen on the surface of Neptune.
Invented by F.S.E.V

This Carbon Proton Synthesiser is not use without a Hydro-Lithium-Demerol-Amal-Nitrate Uranium Scrupulator, you idiot!

Hydro-Lithium-Demerol-Amal-Nitrate Uranium Scrupulator by Freddie.V February 9, 2005

Hydro-Gnome 

The more elite form of Sea-Gnome.

You feel a sharp stabbing pain while in the water. You look down and exclaim "Argh, a sea gnome!" Your- in all likelihood unstabbed- friend should then procede to point out "No man, see the oxygen tank? That's a Hydro-Gnome."

Hydro-Gnome by Mr "Sarcastic" March 6, 2011

Hydro classic 

A person that masterbate’s in any form of water ( hot tubs, tubs, jacuzzis, showers, swimming pools

I’m a hydro classic girl

Hydro classic by Kel0692 January 19, 2018

Hydro Dump 

When you have to pee very bad and can't get to a restroom so you padlock and let loose in your ass to hold it until you make it to the bathroom so you can shit it out like diarrhea. This may dislodge fecal matter and come out in spurts causing your ass to have a machine gun effect while shitting.

Levi what the hell happened to your toilet? Joseph you won't believe this. I couldn't make it home in time so I padlocked and pissed in my ass. As soon as I got home I couldn't hold it in my ass any longer and ended up hydro dumping all over the toilet.

Hydro Dump by I Am The Ferrett January 9, 2020

Hydro Tasting 

The action of sampling water in a uncontrollable manner with more than one person.

Today we’re going to be doing some hydro tasting.

Hydro Tasting by Benny’s Comedy Central February 19, 2020