herd-stupidity 

The act of people that are too stupid to realise they are stupid gathering in herds to ward off the actual intellectually superior people.

I was on reddit earlier lurking posts and I stumbled upon this thread filled with nothing but herd-stupidity against the OP

herd-stupidity by Shadou December 28, 2016

stepidemic 

The increasingly more common usage of step-sibling (or step-family) porn on mainstream porn sites, i.e. pornhub. It is a near incestuous fetishization yet is not because the people in the videos aren’t blood related.

“Bro, did you see the most popular videos on pornhub last night? Everyone and their mothers has the stepidemic! Well... everyone and their stepmothers...”

stepidemic by gayestlort September 29, 2019

stupidiot

contraction: stupid + idiot

Honey, that`s not where the salad dressing goes in the refrigerator!
You`re such a stupidiot.

stupidiot by xavier reivax November 6, 2009

Stupiosity 

Billie adds it to her songs.

I want to add some stupiosity.

Stupiosity by billieeilishicantdothissnofloa August 8, 2020

Stupidity 

A failure to see things as they really are, the failure to be open to new information. A human being that is unaware of their surroundings. The learned corruption of learning. Unfortunately for us, stupidity rules the world.

George W. Bush isn't stupid because of his inability to speak. Rather, George W. Bush is stupid because he refuses to learn about policies, history, & public speaking.

Sources: Stupidity Documentary - Albert Nerenberg (Director) Rina Barone (Head of Research)

Go on YouTube and watch the BBC Documentary: Stupidity

Open your third eye

Stupidity by nicjam December 20, 2013

stumpid 

Stupid + Dumb = Stumpid

I can't even think right meow, I'm so stumpid.

You are the stumpidest person I've ever met. Seriously though. So. Stumpid.

stumpid by Alimew June 17, 2017

Stupidity Lag 

the time it takes your brain to realize what you just did was stupid.

you are traveling for work and you decide to surf for porn at the hotel and then later after a 45 minute stupidity lag you realize you are still VPN'd into the office network.

Stupidity Lag by jeremy jackson March 30, 2008