1. The act of two couples switching partners in the midst of simultaneous sexual congress.

2. Successfully dumping your girlfriend in favour of her sister or roommate.
1. Jane and I were givin er when Jack offered Jill up and we did the old switch-er-oo.

2. Person 1: Yep, as soon as Susan moved in with Sarah, I knew I had to have her, so I gave Sarah the heave-ho and now Susan and I are bumping ugly.

Person 2: Holy shit! You pulled off the old switch-er-oo!
by dsfgjdsfgjsdgfds November 10, 2007

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Top Definition
Pretending to be your identical twin (if you have one) to have sex with his or her significant other.
I pulled the Old Switch-er-oo last night on your girlfriend, I didn't realize it was her first time, I tapped that sh*t. Hope you like seconds.
by Jizzle Rizzle January 20, 2003

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1. To switch your own functionally defunct object another's superficially similar but properly fuctioning object for personal gain.

2. Anything sorta similar to that.
I pulled the old switch-er-oo on my friend's NES with my broken one. It's not like he'd ever play it anyway.
by Darth Will Smith July 28, 2008

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Japonese torture technique known as "Ranlofan". The testicles are removed from a criminals scrotum, and the eyes are removed from his head. The testicles are then placed in the eye sockets, and the eyes are sewn into his scrotum-- all while he is awake.
"In punishment for molesting midgets, I condemn you to the old switch-er-oo!"
"NO! ANYTHING BUT THAT! PLEASE!"
by Anonymous January 20, 2003

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When you're slammin it in a girl and then whip your dick out, stick it in her ass as fast as humanly possible, and keep going at the same speed as if nothing changed..
Yeah I was bangin Sarah so hard last night. I gave her the old switcheroo, and now she doesn't talk to me anymore.
by Poopy the Shoemister January 03, 2016

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