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1) (n) Tandem bicycle (bicycle built for two) - Called a divorce maker because once a tandem bike gets moving, the passenger inevitably stops peddling, thus triggering hidden resentment over matters too trivial to mention that build up over time and lead to eventual divorce.

A metaphor for many marriages.
Look over there at how hard he is peddling and sweating on that bike and she isn't even breathing hard just sitting pretty, a tandem bike is nothing but a divorce maker if you ask me.
by Big Bro February 23, 2010