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Something that is as different as possible from something else.
Billy: Your mother straight
Joe: Um ok
Billy: Its opposite day
Joe: fucking end me
Opposite by chiqennugget October 14, 2018
When two things have a resemblance in appearance, character or quantity
“Angry” and “mad” are words with opposite meanings
Opposite by Frederick Yeo November 17, 2023

Opposite Day 

Rooted in playground tradition. A fictional holiday, in which everything you do or say means exactly the opposite. Often used at the end of a sentence to negate what you just said.
"You look nice.... on Opposite Day!"
Opposite Day by Dr. Michael yates January 17, 2005
Word of the Day on July 7, 2005

opposite number

Name: an individual equal in authority, status and capability to ones' self, yet in the employ of a directly rival organization.
After the fall of the Berlin Wall, Agent Smith from the CIA finally met his opposite number in the KGB.
opposite number by speedog June 20, 2010

opposite marriage 

The P.C. way to specify the legal union of a man and a woman, as made popular by Miss California at the 2009 Miss USA pageant.
MISS CALIFORNIA: "We live in a land that you can choose same sex marriage or opposite marriage"
opposite marriage by JusLar April 20, 2009
Word of the Day on April 22, 2009
More from Urban Dictionary

Surf Dracula Syndrome 

A phenomenon in film/television series, most notably streaming series, where the main premise is drawn out to such a point that it takes an entire season or more to get the parts of the series the audience is actually interested in seeing.

For example, if a series is titled "Surf Dracula," a majority of viewers would tune in expecting to see Dracula surfing by the first or second episode. However, the entire first season would instead be tedious padding and backstory before finally ending with Dracula surfing in the last five minutes of the season finale.
I watched "Smallville" on Netflix the other day. Dude, it was ten seasons of filler before he finally flew! Major Surf Dracula Syndrome!
Word of the Day on October 24, 2026

Northstarring

Finding your way back to the truth by fixing on one verified fact and working out from there, the way you navigate by the North Star when everything around you is spinning.
Rumours were flying everywhere, so she went northstarring — one checked fact at a time.
Northstarring by Light Bearer October 22, 2026
Word of the Day on October 23, 2026

Plate of Brown 

A plate of brown consists of foods that have little to no nutritional value, and are typically deep fried. A true plate of brown will also be accompanied by a dark soda.
Wanna go to meal hall & grab a plate of brown?
Plate of Brown by Cheddar Craigson September 18, 2020
Word of the Day on October 22, 2026
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