one-two-switch-a-roo 

The action of putting one's dick into a vagina whilst having one's testicles inside another vagina. Said vagina often has to be previously penetrated in order to be open enough to welcome the above-mentioned testicles.

"I had these two girls over and I pulled a one-two-switch-a-roo"

one-two-switch-a-roo by noirline November 12, 2017

one-two-switcharoo 

The act of performing oral sex on someone, but then switching places with another individual who is at the time making out with that same person.

When michelle was in highschool she once participated in a one-two-switcharoo with a friend.

one-two-switcharoo by Jamison H January 8, 2008