When two or more people masturbate at the same time.
When I walked into the room RJ and Adam were tandem fapping to pictures of my mom again.
by Shanus teh Anus January 28, 2008
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This is when two random things happen at the same time.
For example two complete strangers falling over in the same area at the same time. Or two people saying an unusual phrase at the same time like "I poke bagers with spoons" That is random tandem!
by Joe Richards March 19, 2007
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We two people poo into one receptical simultaneously.
Me and my girlfriend just had our first tandem poo. It was more emotional then sex.
by the grumpy nipple doctor February 5, 2012
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The practice of two individuals tanning in a tanning bed for two, whereby the subjects enter into a dual suite for the purposes of obtaining a tan by exposure to UV light. Often used in gay-friendly facilities.
Mario tandem tanned at the 12th street gym for too long, now he looks like George Hamilton.
by liebman July 31, 2009
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a group of overweight people (gores) walking side by side or in a straight line fashion, often taking up a large majority of the provided walking way
Professor: Jim Boy, why are you late to class?

Jim Boy: Sorry professor, I got stuck behind a gore tandem.

Professor: Oh don't worry, that's perfectly understandable.
by Nhoj Nosnikta December 3, 2011
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Tandem titties refers to two sets of titties in close proximity of one another such as two nude women hugging. Or two girls in bikinis with their titties touching. It can also be referred to a threesome when there is one man and two women.
"I got a great pic of some tandem titties on the boat last night!"
by Mikey P June 21, 2016
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