When drunk and horny lovers make out after one or both having vomited and not yet washed their mouth(s).
Dick and Jane were so fucked up on New Years, to celebrate at midnight she puked and they started barf swapping in the middle of the party.
by Inhibitited May 2, 2016

the ultimate game-changer - calling Yankee Swap at any point during any game (chess, Settlers of Catan, etc.) allows for an abandonment of the previous rules and the reign of a new order.
Player 1: "Hey man, you can't just trade in one of your pawns for a queen and a rook!"
Player 2: "Whatever man, it's Yankee Swap."
Player 2: "Whatever man, it's Yankee Swap."
by American Periscope April 25, 2013

A maneuver which a male engaged in vaginal intercourse attempts to stealthily swap into anal intercourse with minimal resistence from the female.
So I was totally having sex with this chick and decided to bring out the phantom swap. It didn't go over well.
by Teh Beej July 9, 2006

At an epic house party in Breckenridge last weekend, I saw two bankers resolve their fiscal differences with an old fashioned Colorado Swap.
by AdultContemporaryJizz June 23, 2016

Recreational sexual intercourse or sexual activity between 2 or more married couples where the wives becomes the "temporary" sex partners of the husband of the other wife.
Kevin and Rita are married. Tonight they met with another married couple John and Kathy. The couples did some wife swapping. So John had sex with Rita and Kathy fucked Kevin.
by Taddy January 23, 2005

by The Problem Solver June 22, 2004

by poopo1593 July 14, 2020
