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insidious 

Insidious (adverb insidiously)

developing in a very gradual, in a stealthy manner, with the intend of causing damage.
Prostate Cancer is an insidious disease.
insidious by piece September 18, 2006

Insidiosity

The action of having a large or long wood
His wood is large beyond comprehension, it’s insidiosity.
Insidiosity by Smoked Paprika August 16, 2021

Insidious 

Just watched Insidious it was shit scary
Insidious by xizzie3 October 27, 2011

Iridious 

Iridious is a great person with a big big heart. He will always be there for friends and is very loyal. He will never stab you in the back or judge you. He loves hard appreciates the little things. Fun loving and caring. He always looks for the in people because it exists in everyone.

Friendships are a life time commitment to him. Always willing to listen to and make time for the people closest to him.
"That Iridious, he's a good kind hearted man. Talk to him, you'll see."
Iridious by Iridious December 22, 2016

indicious 

The characteristics of being both delicious and concurring that deliciouness?'d

or can also be used as the best of something ever or the worst of something ever.
That Papa John's pizza was quite indicious.
or
You're looking rather indicious tonight (for the ladies)
*note : can mean good or bad
indicious by hobopower April 30, 2005

Insiduous 

A leafless tree that looks threatening and possibly harmful. Typically in a dark forest.
"Holy shit! Those insiduous trees are grabbin' Snow White! Run, Bitch, Run!"
Insiduous by Trrumoi February 19, 2018
More from Urban Dictionary

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026
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