stupiderest 

stupider than the stupidest.

"your stupiderest than that turtle."
what-

stupiderest by ofmiceandhorizons May 16, 2014

stupidestrian 

Someone who walks in front of a moving vehicle. (see also Stupedestrian)

Sarah walked out into the road without looking, she's such a stupidestrian. (see also Stupedestrian)

stupidestrian by Sarah Anderson March 9, 2008

stupiderer 

more stupid than something

you are stupiderer than him

you are more stupid than him

stupiderer by scott walton November 27, 2006

Stupidest

It’s not a word, but it will be one day. You can use the word if you’re in an argument of some sort or just a regular conversation. Like said, it will one day become a word...

Me: I’m the stupidest here!

Stupidest by Moaning Earrape March 24, 2019

Stupidest animal on the planet 

Cooper

Cooper is the stupidest animal on the planet.

Stupidest animal on the planet by Doug Jiggly Jr. October 18, 2021

stupidest promotion ever 

Urban dictionary's "buy a ____ mug for your guy trump"

"Hey, did you see urban dictionary promote trump in a really awkward and clunky way?"
"Yes, that was the stupidest fucking thing ever."
"Yeah... stupidest promotion ever, dude."

stupidest promotion ever by Soniccarcrashsim February 16, 2023

stupidest

The dumbest; The most stupid;

That is the most stupidest thing I've ever heard, gosh that is dumb

stupidest by Anonymous March 16, 2003