Roundcat 

Roundcats are cute (and huge) cats that come from super doomspire, a game on roblox.

You can play a mode called Roundcat Rally in a public server; it basically consists in defending your roundcats by building walls and blowing up the opponents' roundcats.
On Roblox egg hunt 2020 (Agents of the E.G.G.) The roundcat egg was released. It was an alternative way to represent the roundcats.
You could earn it by getting 30 eggs that dropped when you killed someone.

Me: hey dude wanna play super doomspire?
R. Friend: sure let's play the ROUNDCAT rally mode!

Me: Ah well I have the roundcat egg on my head so I can definitely win.

Roundcat by Cbrauts707 August 12, 2021

Roundation 

The desire to increase the size and or shape your buttocks.

I would like to see more roundation after my workouts.

Roundation by RC Love February 4, 2020

Roundatard 

Someone who is unable to negotiate a roundabout style intersection.

I was stuck behind a roundatard last night for like 10 minutes before they actually pulled out to merge.

Roundatard by mad_driver October 22, 2009

Roundaturn 

A strange junction in the UK that has been royally messed with by the council to mimic a traditional roundabout but happens to just be a collection of turns and corners and isn't covered in any driving lessons before EST. 2010. Sometimes it can include traffic lights and giveway signs that don't make sense for a roundabout. Mostly found in citys that already have a bad rep for traffic but the council want to add extra obstacles that you have learn how to deal with, first timers have no hope and experienced roundaturners will piss all over other drivers whilst beeping their horns and shouting they are doing it wrong.

Looks like we have another victim of the roundaturn, I can they even drive!

Roundaturn by Petshopgirl August 17, 2022

Roundation 

A word used to describe curvature of objects.

The Roundation of that sphere is X, The circumference of a circle can be calculated using either C=𝜋d or C=2𝜋r.

Roundation by Old urban dictionary November 16, 2023