one-man luge 

When you finally go to bed after a 48-hour Vegas coke, booze and hooker binge and you lay on your back in the hotel bed, staring at the ceiling, arms tight to your sides, losing your shit, questioning your decision-making ability and praying you'll survive.

During breakfast at the Bellagio: "How'd you sleep last night? Do a little one-man luge in your hotel room?"

one-man luge by Toastwaver July 13, 2016

One penis policy aka OPP

In polyamory and open relationships, when a (cis) male feels entitled to all of the women he wants, but demands that his primary not sleep with other men. Hence, a "one penis policy," or OPP.

My husband fucks anyone he wants, but I can't sleep with other men because of his fucking insecure One penis policy aka OPP

One penis policy aka OPP by @ExcellentSmell December 25, 2021

One Piece 

Before he was executed, the legendary Pirate King Gold Roger revealed that he had hidden the treasure One Piece somewhere in the Grand Line. Now, many pirates are off looking for this legendary treasure to claim the title Pirate King. One pirate, Monkey D. Luffy, is a boy who had eaten the Devil's Fruit and gained rubber powers. Now he and his crew are off to find One Piece, while battling enemies and making new friends along the way.

One Piece aired in the U.S. on Toonami in 2005.

One Piece by ♫ Highway to Hell ♫ August 31, 2010

One Of Us 

When one person in a group isn't down with whatever the rest is doing, all the others chant this phrase until that one person wants to join in.

Ethan: Hey guys, I heard the new mall is opening today! Do you want to cut class with me to go check it?
Cody: Yeah, bro. How about you, Mark?
Mark: I'm already excited to go with you guys! Trey, you're coming, too, right?
Trey: No, I'm afraid I can't come with you guys. It's too risky, and I might get in trouble.
Ethan, Cody, and Mark chant "One of us! One of us! One of us! One of us!"
Trey: Alright, fine. I'll go with you guys.

One Of Us by realest tho. June 24, 2016

One Eared Elephant 

The One Eared Elephant is a maneuver in which a man turns one pant pocket inside-out while simultaneously exposing his penis through the zipper of said pants.

Have you ever seen a one eared elephant? Do you want to?

One Eared Elephant by jawbutt_teh_nutt February 12, 2008

One True Love 

Someone that you would gladly do anything for and keep them happy even if you lose everything Because of it. Your otl is someone that you believe in no matter what if they cry you cry if they hurt you hurt.

Olivia is my one true love

One True Love by LodiDodi11 March 4, 2015

One Deep

A lifestyle of being your own man/woman; Independent of all other beings; A state of being non-reliant on others for satisfaction in life.

"That man lives life one deep."

One Deep by DHizzie December 30, 2006