To betray someone by seeing a film with one person when you shud have shared the motion picture experience with someone else.
I had to go see CHICAGO a second time, this time with Terri, even tho I had seen it with Nancii; otherwise the movie adultery would come out.
by Jake March 26, 2004
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The price of cheating on a spouse, usually encompassing costs like alimony, child support, utilities, housing, cell phones, food, and vehicles.

The tax is often paid to both the spouse & the piece of ass on the side, and is necessary to avoid a public scene of marital discontent involving wrecked cars, burned wardrobes, trashed houses, midnight shouting matches in the front yard, etc.
SteveBro: "Dude, paying this adultery tax is killing my paycheck."

DaveBro: "Really, Bro? Try missing a payment on that shit and we'll be reading about you in the newspaper!"
by BeepoZButtbanger October 4, 2013
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When you and your spouse say you are going to eat healthy together and then one of you eats fastfood in secret
It was only 2 weeks into the new year and I committed fast food adultery behind my wives back.
by Glenydotcom2 January 8, 2018
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A man or woman who tries to sleep with people who are married and tries to fuck that shit up
"Alex, you're a slut .... you're an adultery slut"
by scrummybag February 20, 2018
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