To simultaneously and unselfishly scratch in a relaxing manner, the inside of each others forearms. When one is scratching, the other simply extends fingers so as to scratch the partners arm as well. Everyone is a winner.
Lying on the sofa trying to stay awake while watching Disney films, one extends arm onto partners lap, Tandem Scratch takes place and therefore both are getting even attention!
by Gordon Star July 6, 2011
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When you and the person you are fucking, bust a nut at the same time.
Tandem nutting is the best possible outcome when fucking.
by ILYSBNY May 12, 2020
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An FMF threesome where one woman rides the dick while the other woman rides the man's face.
The threesome fantasy was complete when ladies laid him on his back and rode him like a Tandem Bike.
by Jamalizm August 5, 2010
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One of those irritating couples that think they have to do everything together. Often won't hang out because their fellow biker has already made their plans for them. They may also coordinate outfits. The name suggests that they even choose their mode of transportation to feed their habits.
Ryan had to check with his girlfriend before he could RSVP, so I doubt he'll show. No doubt she already has plans for him to watch the Bachelorette or something. Fucking tandem bikers.
by Bro Ken Femur August 22, 2011
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The act of sitting on your partners lap while they are sitting on the toilet n pooping together.

Reverse tandem, is facing each other.
Christine sat on shawn's lap and they dominated a tandem poop together.
by mopar340 September 16, 2013
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When two or more people puke off a hotel balcony onto the balcony below after drinking heavily.
Bro 1 - "Bro, let's take some straight tequila shots without a chaser."

Bro 2 - "Fuck yea Bro!"

Shots down and they both start to puke off the side of the balcony onto the one below it resulting in the act of tandem puking
by sarge the boss June 8, 2009
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Having sex on LSD on April 19th - bicycle day
Me and Jessie are going to frolic in the meadow then we're riding the tandem for a while
by j-masta420 April 20, 2009
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