Skip to main content
Urban Dictionary Merch
Your favorite words on things you can wear, drink from, read, or give to a friend.
The Urban Dictionary Store sells gifts you’ll have to explain.

pernicious

adj. causing great harm, or death, or something else real bad.
DAMN that was a pernicious fart.
pernicious by Emetic August 28, 2003

persidious

adj.

A play on the words "perfidy" and "insidious". It pertains to an act of treachery that is masked by a seemingly strong sense of justice or righteousness.
Persida Acosta's crusade against Dengvaxia is PERSIDIOUS ambulance chasing.
persidious by alt_DOH September 26, 2019

Pernicious Love 

Having love for somebody that causes harm towards you, knowing full well it’s bad for you. You want to stop, but you always come back.
“I don’t understand how she keeps coming back to that monster!”

“She’s feeling pernicious love.”
Pernicious Love by Luca Simpson January 11, 2019

pernicious

Describes something that really messes you up. Most of the time you can't tell at the beginning but before you know it, it really fucks you up.
Person 1: It ain't worth it bro, you know Prozac is pernicious. Don't take it.

Person 2: Too late, I can't get off of it now.

Person 1: Damn, I hope you don't get erectile dysfunction like that other kid.

Person 2: Too late for that too...
pernicious by Moses D. October 8, 2011

Peridious 

A God in the Motion Graphics and Arts field: Peridious feels like a fast paced thrill ride with twists and turns of raveshing fufillment. A Master of all types of gaming including console and computer.
The one and only Peridious.
Peridious by Matt Luckey October 14, 2006

pernicious

Having a harmful effect especially in a stubble or gradual way
The pernicious weed has spread all over the flower bed
pernicious by Banditzzi May 26, 2022
More from Urban Dictionary
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026

Respectfully 

Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.

After school, The Modells on Jamaica Ave was active. Respectfully.
Respectfully by john quan the first December 20, 2020
Word of the Day on September 26, 2026

You met me at a very Chinese time in my life

A moment in time where you feel distinctly Chinese over all other things.
Dante: "I wish I could be Nigerian, but I can't because I'm Chinese. You met me at a very Chinese time in my life."
Word of the Day on September 25, 2026
Load more