Three-Horned Rhinoceros 

Obviously, this is when 3 men engage in sex with no woman or additional parties.

Hey Steve, you comin' 'round tonight? Me and Jim are trying to set up a Three-Horned Rhinoceros....just need one more!

Three-Horned Rhinoceros by BrightonWatch May 14, 2014

Disgruntled Rhinoceros 

The act of putting a strap on dildo to your forehead and engaging in rough anal sex with said strap on dildo.

Dude 1: "Dude my ass hurts so much!!"

Dude 2: "Why?"

Dude 1: "My girlfriend gave me the Disgruntled Rhinoceros last night"

Dude 2: "Damn, how did she talk you into that?"

Dude 1: "She promised she would let me do a Jamaican Pile Driver"

Dude 2: "So worth it"

Disgruntled Rhinoceros by hardcoredeathcruster February 26, 2009

Rhinocerous 

A white trash overweight unicorn

that's no rhinocerous my friend... that's an overweight white trash unicorn!

Rhinocerous by Allison T February 10, 2008

Rhinoceros Fart Flute 

The act of filling a black dress sock half-full with cheerios and inserting the sock analy.

"I was so drunk last night, I can't believe I let him play my Rhinoceros Fart Flute."

Rhinoceros Fart Flute by Smittmiester May 4, 2008

Rhinocerosing 

to bury ones head into something and use a foot or paw to try to move or uproot, like a rhinoceros

Huck was rhinocerosing me to take my spot in bed

Rhinocerosing by racerrob November 14, 2014

rhinoceros nuts 

Slang term describing bravery using the rhino because of its gargantuan size and impenetrably thick skin.

That guy is undoubtedly the poster boy for rhinoceros nuts, he speaks truth to power no matter what the consequences may be.

rhinoceros nuts by Dr Bunnygirl August 24, 2019

Rhinocerously Fat 

A living organism whose mass is so great that it can be labeled with it's own personal ZIP code. A creature with a neverending desire to consume it's surrounds. Usually referred to as "Fat Guy" or "That Cowish Mofo." Inspired by the hefty shape of a Rhinocerous, who spends most of it's time grazing and rarely moving, only being able to run for seconds at a time. Behavior such as this is apparent in those who may be aptly dubbed "Rhinocerously Fat".

"Wow, have you seen how Rhinocerously Fat that kid Carmine has gotten?"

Rhinocerously Fat by Some Diesel Kid Who Thinks He's God September 9, 2008