dunderoo 

It’s someone that doesn’t say thank you when you hold the door open for them

NO! Thank you, you dunderoo

dunderoo by Kop April 15, 2021

Dunkeroo 

Is a sex move that consists of a man blowing his load in their partners belly button, The man then proceeds to dipping the tip of the penis in it. The man then puts it in their partners mouth. This completes the Dunkeroo.

That girl got a dunkeroo last night from Big Joe

Dunkeroo by Big Joe PT December 28, 2019

dundroo 

Anything random thing whose name is not known or doesn’t come to mind immediately

I can’t find the ‘dundroo’ to open this sealed bottle.

Where’s the ‘dundroo’to shape eyebrows ?

dundroo by Terrypedia June 18, 2021

dunderson 

A complete idiot, a yobbo, a bogan, a redneck, a simpleton. Lacks culture, usually in the lower socio economic demographic, and is sheep like in the way they follow everyone else. They believe everything that is trotted out to them via the media.

This neighbourhood is full of dundersons.
His dunderosity is exceeded only by his ugly looks.

dunderson by wally walpamur November 7, 2007

dunkerooster 

one with missing teeth and squinty eyes

them hicks from alabama is dunkeroosters

dunkerooster by KDIZZO (KB) March 13, 2005

Dundroo 

Any random thing for which the name is not known or doesn’t come to mind immediately. Mostly used by forgetful or ignorant people.

Where’s the ‘dundroo’ to change the tv channel?

The ‘dundroo’ of my shoe broke.

Dundroo by Terrypedia June 18, 2021

Dunkeroo 

When you are having sex with a woman from Australia and you dip your penis between the vagina and the anus.

Hey man! You know that girl from Sydney, I met last night? I gave her a good Dunkeroo!

Dunkeroo by DirtyChefM August 21, 2015