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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

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