Cat Unit 8 Underwater Mariner Unit 

See: CU8M, Cat Unit 8, Cat Unit 8 Mobile Flying Unit
Submersible-based unit to mobilize Cat Unit 8

I've heard salty tales of the Cat Unit 8 Underwater Mariner Unit

Cat Unit 8 Underwater Mariner Unit by tito December 30, 2004

running underwater 

Describes the action of an individual that is not fleet footed. Especially when pertaining to sports, when an athlete is slow.

"Smitty takes so long to get to first base, its like he's running underwater!"

running underwater by sheeet December 9, 2008

living underwater 

Living in your own alternate reality or being eccentric

Stop living underwater and get back to reality.

living underwater by Uncle Dimma March 21, 2021

The Underwater Splits 

when you are forced to watch someone doing the under water splits over and over again until you almost drown

I'm not going to Johnny's house again. I can't watch any more of The Underwater Splits.

The Underwater Splits by Lorraine Haul May 21, 2024

Take ten deep breaths underwater 

Its what you say to Neo Nazis, incels and so called gnome hunter's on TikTok, for example:

Dude 1: "Now yuo see" / "aryan classic"
Dude 2: "Take ten deep breaths underwater, you fascist cunt"

Take ten deep breaths underwater by ToyBoy§§ July 5, 2023

underrated comment 

The response to every top YouTube comment.

*clever comment with thousands of upvotes*
“underrated comment”

underrated comment by pqalmz November 1, 2020

The Undertaker 

When you throw your partner off Hell in a Cell, and they plummet 16 feet through an announcer's table.

"I gave my GF a sexy The Undertaker last night."
"Is she okay?"

The Undertaker by ahmahm June 23, 2017